Top Definition
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

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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

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Lotsa space for your liquids.

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Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt