Stuart Dooley (usually referred to by his last name, even by other members of his family with the same name) is a deep-voiced, laconic teenager and one of Bobby's classmates at Tom Landry Middle School. Dooley is voiced by Mike Judge. Dooley was born on October 25, 1984.
Dooley has shaggy red hair and is always seen with a blank, staring expression on his face. He always sardonically intones something obvious after witnessing an event while making those statements sound like put-downs. For example, after seeing Hank's new lawn infested with fire ants, Dooley says to Hank, "You got ants," and bluntly stating to Bobby, "Your dad got blown up," in "Death of a Propane Salesman". Besides being a put-down artist, Dooley also seems to be something of a bully, taking quiet pleasure in saying things to people to sadden or anger them. For example, when Bill is having fun at Bobby's birthday party, Dooley says, "Your wife divorced you." Another example is when he threw donuts at the kids in the plus-sized fashion show with little or no remorse. Despite being a bully, there are instances where Dooley has been shown to be sympathetic to others; in "I'm With Cupid", when Bobby gives Joseph a rose corsage to try and make him look more popular to girls, Dooley mistakes both boys as lovers and remarks, "that took courage." In "Tears of An Inflatable Clown", when leftist Arlen School District representative Dr. Pope wrongly accuses Dooley of being connected to African apartheid and ethnic cleansing due to his Dutch heritage, Dooley is horrified and decides to join Bobby and several other students in a "healing assembly".
Dooley lives in a two-parent household and has a younger sibling, as shown in the episode where he runs away, although only for a brief period.
Dooley spends most of his time socializing with Clark Peters, another child bully. In later seasons, he's in a small gang of friends with Clark, Bobby, Joseph, Emily, Connie, Lori and Ramon. In "No Bobby Left Behind", Dooley and his friends get wrongfully diagnosed as "special needs" and sent to a separate class, going on a field trip to Alamo Land as a group, where Dooley and Ramon show off on a log flume ride to impress Lori. Dooley's voice and manner of speaking are similar to that of Butt-Head from Mike Judge's previous show, Beavis and Butt-Head, albeit without Butt-Head's trademark obnoxious chuckling. Beavis and Butt-Head also had a character named Stewart.
Dooley's trademark is that he usually speaks in phrases of two to seven words. Because of his sardonic delivery, his phrases are generally memorable even when he's talking about something mundane.
- "Your dad's white trash."
- "Joseph likes to watch." (After coming out of Bobby's closet with another girl).
- "Your dad lost his job." (To a random boy during a baseball game.)
- "I'm a suspect." (When he and Clark were busted for truancy.)
- "This party is boring. Everybody hates you." (To Bobby at his birthday party after Bobby said a not-very-funny joke.)
- "Tell me more about jail."
- "I want to go home."
- "We're gonna get to see her boobs." (In reference to Peggy's teaching Sex Ed.)
- "There's dust coming out of your butt." (In reference to Bobby's rodeo clown act.)
- "I peed in some kid's locker."
- "I saw her panties." (On seeing Luanne at a dance being tossed into the air by her partner.)
- "Tú eres puerco." (Spanish for "You are a pig." He said it to Peggy on a Spanish-class field trip when she admonished him to speak in Spanish. Ironically, Dooley speaks better Spanish than she does.)
- "Tú eres muerto (You are dead)." (To Randy after being told on.)
- "I'll die in these horns." (To a teacher who told him to take off his headgear)
- "I'm gone." (Said in one episode when he ran away, only to return later in the same episode when he announced, "I'm back.")
- "That took courage." (After seeing Bobby giving Joseph a flower pin)
- "You shot her in the eye." (To Bobby, who dressed up as Cupid at a Valentine's Day party and shot a plunger arrow at Connie.)
- "I pass." (In reference to a math question asked by Coach Kleehammer.)
- "I pulled your pants down." (To Peggy, when he acted up in a Spanish class where she was substitute-teaching; she then spanked him in class, which got her in trouble. Earlier in the same episode, he was making fun of Peggy behind her back, and when she told him to stop, he responded, "En Español, por favor (In Spanish, please).")
- "That's the bell."
- "I thought you were fired." (To Peggy when she entered the classroom, saw him, and asked if he was still suspended.)
- "Your feet are big." (To Peggy, when she saw a crude picture of herself with her pants down.)
- "Cool." (After Peggy taught the class about the Spanish Inquisition.)
- "Your grandmother loves you." (After Bobby's secret Valentine turns out to be Peggy's mother.)
- "My future starts today." (In reference to job shadowing for Career Day in "Business Is Picking Up".)
- "My Hank died." (After losing in the Pro-Pain! online game in "Grand Theft Arlen".)
- "Your dad got blown up." (Informing Bobby of the Mega Lo Mart explosion, which Hank was involved in.)
- "Because they're volunteers." (Responding to a student's question as to why Hank, Dale, Boomhauer and Bill can't open the fire hydrant. A Fire Fighting We Will Go)
- "He's a volunteer." (After Bobby confirms that Hank is a fireman.)
- "She still wants to dance." From "Bill Gathers Moss".
- "Dutch." (response to a teacher asking about his ethnic heritage.)
- "I'm uncomfortable." (seeing Bobby with 3 girls who've dressed him in girls' clothing and cat face makeup at the Arlen Mall).
- "You care about me."
- "I can see your dad's junk." (to Joseph, when Dale shows up at school wearing Native American regalia and a thong.)
- "You thought he was a dog." In "Gone With the Windstorm".
- "They're new." [about his new white shoes] In "Talking Shop."
- "Your lunch money had a Canadian quarter in it."
- "I stole your fake leg."
- "But I only saw one set of footprints because God was holding me." (loosely quoting the poem Footprints in "Sleight of Hank.")
- "You've got an hour." (to Bobby after being bribed with money to run away from his parents.)
- "You weren't invited."
- "Your wife divorced you." (Reminding Bill about his divorce when he was having a good time at Bobby's birthday party.)
- Death of a Propane Salesman
- A Fire Fighting We Will Go
- To Spank, with Love
- Sleight of Hank
- Love Hurts and So Does Art
- I Don't Want to Wait...
- What Makes Bobby Run?
- Luanne Virgin 2.0
- Hank's Choice
- It's Not Easy Being Green
- Kidney Boy and Hamster Girl: A Love Story
- Get Your Freak Off
- Bad Girls, Bad Girls, Whatcha Gonna Do
- Full Metal Dust Jacket
- Vision Quest
- The Witches of East Arlen
- In the episode "Tears of an Inflatable Clown", Stuart revealed he is of Dutch descent, though he has a very common Irish surname.