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a strange little man with a love for puns and being all-around obnoxious. stay away from him at all costs.
Duncan: H-
Me: don't. just don't.
duncan by duncanhater000 February 13, 2018
A dude that loves them girls with the ghetto booty
Duncan: "I love them ghetto booty's"
Duncan by Bitchboy7 January 22, 2018
A stupid motherfucker with a tiny dick who thinks he's awesome but is actually super gay
Oh that guy, he's a Duncan
Duncan by Not gwyneth February 22, 2017
Someone who will not hesitate to stuff an object into your rectal cavity
bro1: so what was the outcome, what did the doctor say?
bro2: Maaaaaan, he stuck his finger up my ass and said you've just been Duncan'd..
bro1: that's deep
Duncan by WhoaPlayer December 13, 2018
Purposefully saving a bowel movement for when on the clock at work, thereby effectively getting paid for it.
"I'm gonna take a duncan then go on my lunch break."
Duncan by KoreRat January 24, 2014
(Noun)

-Someone who has mediocre hair
-Someone who thinks that their hair is better then it really is
Don't be such a Duncan! You know my hair is better than yours!
Duncan by genius definitions 101 October 15, 2014