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K.A.B.F is short for Knee Buckling Ass Fuck. Often times used in a derogatory way towards someone.
"God damn Mary needs a good K.A.B.F she is so uptight"
K.A.B.F by Blakalake September 17, 2008
"Blank Firing Adapter" an ugly orange painted device that is fixed to end of your M-16 restricting the gas flow from the blanks out the barrel so that your weapon will cycle as per live rounds. Without the gas blowback created by a real bullet travelling through the barrel, the weapon will not function. So when firing blanks, you must use these to make the weapon cycle properly. If you do not restrict the gas flow with this you will have to fire one blank at a time and manually eject the casing!.
Make sure your b.f.a. is secured properly over the flash suppressor, that could be why your weapon is not cycling in this training exercise!
B.F.A. by CISO May 20, 2007
Backwards Ass Fuck. When someone is supreme dumbass idiot, they reach BAF status...
Cletus is going over to hit on that girl and the B.A.F. doesn't even see that herpes fired up on her lip.
B.A.F. by KnoxHockey November 28, 2006

F.B.A.T.A 

When your friend Zach gets mad and exclames you are a F.B.A.T.A he is referring to you having a Floppy Bitch Ass Tit Anus
Dom you idiot you are such a F.B.A.T.A
acronym; stands for Bored As F--k
He was B.A.F because he couldn't go play pool.

Man, I went out with that chick and was BAF the whole time.
B.A.F by Boomer December 21, 1999
You think Tosh.0 is hilarious, but it's actually B.A.F.
B.A.F. by Someguy50 November 11, 2012