(n) slang for nitrous oxide
let's all do some dumb!
by pandora April 19, 2005

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you. (because you ACTUALLY had to look this up)
they laughed at him for an hour because he
told them that he had to look dumb up on urbandictionary.com
by Karen C. July 06, 2005

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adj. More then likely you are DUMB because you had to waste a few brainwaves and time to look up the word. The word is often written dum because the person is too ignorant to be able to spell an easy word or they don't realize that it has a silent b like comb.
You are dumb for looking up dumb on urbandictionary. com instead of doing it secretly in a library.
by sgkitty February 03, 2005

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The definition of dumb is you
You are dumb for looking up "dumb" in the dictionary
via giphy
by Urban Dictionary #666 January 01, 2017

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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