B.U.F. 

Back Up Fuck. When your sex partner is away and your really desperate you get a back up fuck to keep you "company".

Girl : Hey Guy my BF is out of town for the week and im really horny you wanna be my B.U.F. ?

Guy: Sure just be naked when I get there

B.U.F. by Black on Blue February 23, 2011

B.U.F.U 

By Us Fuck You

we wear BUFU

B.U.F.U by Chad November 10, 2003

B.U.F.F.E 

Best unicorn friend for ever

Sophie is my B.U.F.F.E.

B.U.F.F.E by Dhrhrveg December 5, 2016

B.U.F.F.Y. 

An acronym that stands for Beautifully United Friends Forever... YES!

JB and Paul are each other's B.U.F.F.Y.

B.U.F.F.Y. by B.u.f.f.y. January 11, 2009

B.U.F.F 

Big Ugly Fat Fuck, aka, that annoying guy who considers himself to be all that, but in reality said person is just a douche bag. The term is typically used in veiled sarcasm by everyone else around said person, since he is far too oblivious to the intended meaning.

Troy: "Hey Jerry, you're looking pretty B.U.F.F. there, you been working out?"

Jerry: "What? Nah, I'm just naturally this way."

Steve: (to Troy, after Jerry walks away) "Did you really mean that?"

Troy: "Yep, he really is a Big Ugly Fat Fuck"

B.U.F.F by Erkadurka December 1, 2011

b.u.f.f. 

Big ugly fat friend. Usually refers to a freind that makes you look a whole lot better in social situations.

I,m gonna go to the bar this weekend and bring my B.U.F.F. Jeff.

b.u.f.f. by Denny D. Bat April 28, 2006

B.U.F.F 

Sorta like the term D.U.F.F, meaning designated ugly fat friend, the word B.U.F.F means, black ugly fat friend.

Girl 1: Hey do you want to hang out later?
Girl 2: Yeah! Make sure you call Lisa, shes our B.U.F.F.
Girl 1: Oh, good call, I will see you girls later.

B.U.F.F by Steet August 21, 2009