bfm 

Big Fucking Monster. Used to describe, in gamer terms, a creature that is unreasonably large or powerful.

We really could have used your help defeating that BFM last night! It took hours without you.

bfm by wufalder March 27, 2009

BFM 

big fat meanie.

when someone does something mean, or hurtful, or offensive, etc...such as trip you and then laugh.

you turn around and say (in a pouty voice for better effect), "you're a BFM."

BFM by ferocitas. March 14, 2008

BFM 

The acronym stands for "best friend moment." When two or more friends have done or said the same thing simultaneously. Also occurs in past/future forms.

EX.
Person 1: are you guys going go the party?
Person 2 & 3: yes!

Person 1: you just had a BFM!

EX. 2
Person 1 & 2: (both drop their book at the same time)

Person 1: BFM!

EX. 3
Person 1: should we leave soon?
Person 2 & 3: yes!

Person 2 & 3: bfm!

Person 2: ahhh that's a double bfm!

BFM by Lmunhall May 25, 2011

BFM 

Black Fucking Magic.

All my logic says I shouldn't hang with her, but there's that BFM between us.

How does your computer DO that? BFM!

BFM by Zimster June 21, 2009

BFM 

Big Furry Monster, I.E., the biggest creature Magic the Gathering has to offer. It takes two halves of the card to summon and 15 black mana, and it's a 99/99 and can only be blocked by three or more creatures. It's the biggest, baddest, nastiest, scariest creature you'll ever see.

"It was big. Really, really big. No, bigger than that. Even bigger. Keep going. More. No, more. Look, we're talking Krakens and Dreadnoughts for jewelry, it was BIG!"
-Arna Kennerild, Skyknight

BFM by -The Omega Master December 18, 2004

BFM 

"Begging for Money", as popularized on Audiworld Off-Topic Nov. 2008.

AWOTs favorite new phrase "Begging for money", BFM FTW.

BFM by KennyAWOT March 30, 2009

BFM 

big fat meanie

I'm sorry I'm just a BFM lol

BFM by saraki11s May 7, 2014