Any time you use the word "gay" to describe something you don't like. It is based on the tv edumercials staring Hillary Duff. The commercials are intended to stop this use of the word "gay" which is in itself a good cause, but the commercials are so ridiculous that they have become a joke on their own.
guy 1: Hey did you hear that Mr. Garcia is collecting our current events TODAY??? That's so gay!

guy 2: Hey man, Hillary Duff Would Not Approve
by Changus Kahn July 11, 2009
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duff muffin

someone who is utterly crap at mario party..for instance your playing later skater and you just won with a record time and meanwhile the duff muffin is still on their first lap
Matt: Yes! i just won...wait whos the duff muffin
by SoccerFanaticMC@Hotmail.com August 11, 2005
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Cassandra M. Duff

A shy, Beautiful young girl. This girl has a short temper, and loves to draw and listen to a small selection of music. With a very adventurous imagination, a very polite attitude, and above average intelligance, she is a very fine young woman.

Warning: Easily erritated by short, pushy boys. May cause bodily harm if tamperd with.
by Someone who cares February 10, 2005
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duff (v.) (eng.)

to attract a person of the opposite by bending one's arm at a 45 degree angle and resting it on his/her head then proceeding to rest that arm on the nearest solid object. the "duffer" proceeds to be in close proximity to the "duffy" and ask said "duffy" ridiculous questions in a terrible attempt to pick the person up.
Look at Ronnie over there in the corner tryin to duff that girl... Thinkins he's a staahhh...
by Tom Brady February 23, 2004
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Cassandra M. Duff

Sometimes a little strange, or even dangerous. Beautiful and shy none the less.

Warning: may charge like a bull.
"You pissed me off, so i charged your ass."
by Chris Ellis February 09, 2005
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ass duff moo vee

a pre noueashhon of asdf movie
shlod we walch ass duff moo vee 12?
by cb(minecraft fnaf) 1 fan January 28, 2021
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a dumbbutt who can't sing, act, or well, yeah she can look like crap....lol
ona my buddy buds broz saw her and he said shez a beeeeaatch and a bigass!
by natalie October 11, 2003
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