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A word used when someone is excited by something. Or if you see a fit girl.
Wow, look at Sonia.
Duff!
duff by TheWorx December 10, 2008
Related Words
To Fart, flatulate, passing intestinal gas, let one go, squeeze cheeks, float an air biscuit.
"Has someone done a duff? It smells in here."
Duff by Animal Muppet June 10, 2009
an unshaved dick or man bush

from the root muff
judging by that guy's hairline...he's gonna have a duff 'down there'
duff by Brandi McPherson December 28, 2005
that bloody acoustic pinger is duff again
duff by Barry Grace March 16, 2003
Designated Ugly Fat Fuck. A girl that your hot friends bring so you can't get any good pussy.
"Dude, were you able to bang Amy last night?"
"No! I was so mad; she brought her DUFF Caroline!"
"That sucks..."
DUFF by Bo C. May 28, 2007
v. 1. to not follow through with plans to meet someone;
2. to ditch a person
We had plans all week to leave town together this weekend, but he duffed me once again.
duff by BMWBrian October 28, 2006