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Literally stands for Designated Ugly Fat Friend. This is the bitch who comes out of no where to cockblock you when you are about to get a chick home with you. She is often recognizable by her fat ass, bad hair and sour disposition. Her main goal of the night is to fend off any advances on her friend so she will have company at the diner when she is stuffing her fat face with an omelet and a side of disco fries while she bitches about anyone and everyone. The D.U.F.F can be defeated with a high level wingman, but you will be expected to return the favor; a job not for the faint of heart. A naked D.U.F.F often smells like a box of crayons.
"Dude, I was about to bag this chick, but then her army of D.U.F.F's came out of no where and pulled her away. She must be a Volleyball player!"

"Did you Fuck the chick at the party?"
"No Fuckhead, I got Duffed!"
D.U.F.F by LexDimonds July 31, 2009
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This is my last clean pair! D.U.S!
D.U.S by Sam Parsons February 8, 2004
Related Words
u U.S.A u r u.d. U.S.S.R. U.S. U.D.I. U R Gay u-turn u.u

Born in the U.S.A. Ass 

The "Born in The U.S.A. Ass" Is a term that is used to describe the tightness of ones ass, referring to the album cover of Born in The U.S.A, released in 1984.

The album cover contains an image of Bruce Springsteen ass, which is considered to be very tight in that image, hence the term "Born in The U.S.A. Ass"
- Man, Zackary sure has one Born in The U.S.A. Ass.
- Yeah, I wish I had one...
What emo's say because their parents will kill 'em if they say a sweary word.
emo: damn, my eyeline pencil broke :(
emo's friend: haha, you suck!
emo: eff u!
emo's friend: uhhhh... don't you mean FUCK YOU!?!
emo: SHUT IT! my mom will kill me if she hears me swearing, man!
emo's friend: oh, sorry dude!
eff u by americanbeauty August 12, 2007

1337 5/\U(3

Leet Sauce! The gamers and nerdy way to say just how much your own.
WOOT OMFGWTFBBQPWND them! u r teh 1337 5/\U(3!
1337 5/\U(3 by Criminally_Retarded December 27, 2006

ejac-u-beam 

A sporadic discharging of heatvision, brought on by sexual fantasies and/or watching animals copulate.
"HAHAHA!!!! Did you see it, the ejac-u-beam??"
ejac-u-beam by Macky T. July 16, 2003