BM 

BMW - A German car found in many rap songs.

I got twenties on my BM and you still fuckin' wit a GM.

BM by The Don Mega October 9, 2005

BM 

Baby Mama

The girl's crib you have a baby with.

Man I gotta go run to the BM and get some squares

BM by K Dub April 9, 2005

bm 

a big man ... short for big man

fuck! look over there
what
that bm
OH SHIT

bm by mitch_bullo August 27, 2007

BM 

Blonde Moment
Short moment of stupidity that is stereotypical by blondes.

Sorry, I just had a BM.

BM by Explosivo1269 May 13, 2016

BM 

BM by itself means bad mannered(probably not what you expected)

In most battle royale games, people will use the phrase BM either when they are getting finished or if they were going to finish someone else.

BM by Gaming definitions February 21, 2019

BM 

Either baby momma

Or
BMW.

Depends on the reference.

"Oh shit it's my BM callin.. dont make noise but keep sucking. U know she be trippin if I dont pick up.."

Or

"Check out that matte black BM riding by.. shit looks clean asf."

BM by Marv_Elous June 4, 2019

BM 

banky's mom

looks like BM just got here

BM by tr0llm4st3r152 May 21, 2011