One with a strong attitude. Someone who thinks they know it all.
Wow quit being such a duncan today.
by justinbitchbaby August 04, 2012
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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
by Jellyfishsuck December 01, 2015
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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.
by Dynamite65 July 20, 2014
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A stupid motherfucker with a tiny dick who thinks he's awesome but is actually super gay
by Not gwyneth February 22, 2017
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The man who is like the 21st century version of che Guevara, but with a bigger penis. He also specialises in foursome sex moves. His most famous move is the fidget spinner move; this involves a giant fidget spinner penetrating three people's ass holes with a dildo in the middle for the fourth person
I love Duncan, he is so fit oml
by PlsShootMeNow June 13, 2017
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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
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