to defriend someone on Facebook
Man, if Darryl posts one more hipstamatic picture of his stupid kid, I'm going to have to deef him.
by section111 October 12, 2011
Making a "queef" style noise with your penis. Involves getting the air in your urinary tract to form a vacuum - letting the air out with a PRRRRRUITT-sound.
Lol, Steffen just deefed!
by Deefmaster November 06, 2008
Short for defective. Can be used for a multitude of things, from situations that have gone wrong, to things that have broken, to an ugly girls face.
"Dude, you straight deefed that bowl"
"Dude, I was going to smash, but that chicks face was straight deefed."
"Dude, if I fart now, I'm straight going to deef my pants"
by Sog Man April 15, 2010
Exceptionally potent marijuana.
Charlie, I got some deef shit for tonight, dude.
by strokesGuitarist July 14, 2009
A fart a man makes through his penis.
Last night the man deefed accidentally and smelled like skunk poop.
by Samser the Hamster March 17, 2009
An incredibly noisy and smelly poop, mostly dropped at the exact time someone else wants to use that specific toilet.
I thought I heard the Fourth of July firework show start two hours early, but then I realized David was just taking a massive deef.

That chinese food from the end of semester dinner had our entire suite dropping deefs all weekend long.
by Bossjan Nachbar July 01, 2011
A deef is basically a dick queef.
Johnny! Did you just deef!?" "Sorry mom." "You know the rule, no deefing at the table." "Okay."
by Master Bay Terr February 03, 2011

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