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A very short guy who is pretty resourceful. He can crawl through your chimney into your house. Usually he has a very small dick, but girls will claim he knows how to use it. He will also somehow manage to always have connections for the most random ass things, but can disappear for months at a time. When the cops try to pull him over, he runs away.
Hey man have you seen that short guy who has been recently running from the cops on i40?

Yeah man! He’s definitely a Duncan!
Duncan by MoneyHippo January 21, 2019
Theme park worker:Your to small to ride this

Duncan:But I'm old enough

Theme park worker:But your like 3’4
Duncan by YourGrandmotherCar February 12, 2022
One with a strong attitude. Someone who thinks they know it all.
Wow quit being such a duncan today.
Duncan by justinbitchbaby August 4, 2012
A ignorant, stupid person that believes they know more than they do, their physical strength blinds them to the world outside their ego, they emphasis independence when they are reliant on others for support and worst of all they are narcissists.
that Duncan is full of himself
Duncan by Jellyfishsuck March 7, 2016
The pile of shit left beside the toilet at Myers by some punk ass kids.
The act of crapping on the floor, to annoy other patrons and janitorial staff of public washrooms.
I was out grocery shopping with the old lady and wet to the can. Some jerk laid a Duncan.

Just for kicks, my buddy left a Duncan at a Walmart.
Duncan by Dynamite65 July 20, 2014
they are probably a nerd who will go to a grammar school and be president one day .
duncan is offering tutoring at 2:00
Duncan by iluv_me April 16, 2021