Duncan

A stupid motherfucker with a tiny dick who thinks he's awesome but is actually super gay

Oh that guy, he's a Duncan

by Not gwyneth February 22, 2017

Duncan

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

by WhoaPlayer December 13, 2018

Duncan

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."

by KoreRat January 24, 2014

Duncan

(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!

by genius definitions 101 October 15, 2014

Duncan

A fag who thinks that he is the best in the world and that thinks that everyone is queer.

John: Don’t be such a Duncan
Jerry: Oh sorry

by Big Pappy 123 October 16, 2017

Duncan

A creature that doesn't understand what personal hygiene is.

Your such a Duncan

by Jeremiah Wilson June 4, 2019

Duncan

The act of attraction ugly chicks/guys. People named Duncan often like dic but do not consider themselves gay.

"Damn you must be Duncan"

by eiurgnefs;lbrfs August 8, 2017