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1.
BMK
In Croatian forums it means Boli Me Kurac (freely translated: I don't give a fuck).

What do you think about that?
BMK
by Miško September 13, 2006
 
2.
BMK
Black Man's Kryptonite ... the ass of a girl who renders the game of even the most skilled playas useless.
The guys at the bar couldn't keep their eyes off her BMK.
by FB February 21, 2005
 
3.
BMK
Black Man's Kryptonite

Used to describe a woman of Caucasian decent (a white woman) that is fairly nice looking.
1st example

1st guy: Damn! She look hella good.

2nd guy: I know! Damn, that bitch is BMK! Black Man's Kryptonite! I gotta hit that!

1st guy: Yep, I would tap that ass! I'm gettin' weak right now!

2nd example

1st girl: Gurl look at that bitch!

2nd girl: Yeah, there goes another brotha. Lost to that BMK.

1st girl: Yep, ole funky ass white bitch!
by Crump408 February 17, 2011
 
4.
BMK
Bob My Knob.
BMK, bitch.
by Crasy December 22, 2010