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Big Fuckin' Bag, it is the largest bag available, used for more inventory space

Used in World Of Warcraft
TinySenyor: I just bought a B.F.B. for more inventory space
B.F.B. by Asidbath February 2, 2007
acronym for butt fucking buddy; can be used as a noun or verb
She's my sexy B.F.B.

I'm gonna B.F.B. you so hard!!
Big Fucking Baby

Whiny patients in a hospital who bitch about EVRY LITTLE AILMENT no matter how trivial and drive employees of said hospital INSANE.
"My toe hurts, I have a hangnail, my skin's so dry, I need another snack, I have to pee again..."

"Oh my god, what a B.F.B."
B.F.B. by Ron December 19, 2003
Im so B.F.B..
B.F.B. by Uh idk... September 29, 2008

B.F.B.a.F. 

The internet acronym for "Best Friend, Brother and Friend" made famous (sort of) on youtube by Justkiddingfilms in their halloween special. This acronym is used by Unco Same and Unco Chin, and usually confuses the vietnamese duo because of the use of many letters.
Unco Chin(in vietnamese accent): Unco Same is my Best friend, Brudda, and Friend!

Dashawn: Your best friend, brother and... friend?

Unco Chin: Yeah! B.F- no wait- B.F.aFB-no i mean-B.a.F.-

Dashawn(interrupting): Don't hurt yourself know.

(unco chin tries saying B.F.B.a.F.)
B.F.B.a.F. by holy kamera jizz November 5, 2009
Big Fat Black Chick

A particularly large/Fat African American women that participates in a multitude of sports and my excel in Basketball due to her large body which in hand when boxing out
Isaac: Dude!! Kazhe did you see that B.F.B.C on their team???? Were never going to win
Kazhe: O my God she is huge our skinny white chicks will never box her out
B.F.B.C by Kazhe December 17, 2008