A duncecap is a reference to the cap a dunce wears after a stupid mistake. In this form, it is used as a type of insult after an idiotic remark.
When she asked whether or not Julius Caesar was a famous person, i yelled, "Judy, you duncecap! Your stupidity angers me."
by Madstratt March 05, 2012
a small, cone-shaped turd, most commonly encountered stuck to the "head" of one's penis during withdrawal from an unclean anus.
"As I pulled my cock from her chocolate starfish in anticipation of shooting my load onto her bare butt-cheeks, I noticed a smelly DUNCE CAP adorning my head. Too late to stop, my load propelled the DUNCE CAP like a stinky poo rocket ship square into the back of her head, knocking her unconscious."
by Old Carndog December 16, 2013
A dunce cap is a hat you canβt remove from you characters head in Grand Theft Auto 5 Online, it will be removed when you are I longer a bad sport or not in a bad sport lobby (how you get the cap in the first place) you will sometimes see someone with a dunce cap in a clean player lobby they have that because they did an outfit glitch to keep it with the outfit they had on in the bad sport lobby.
by Bloodjdjfj July 28, 2019
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