BM 

"butt mess" - need i say more?

EEGADS-Someone didn't flush their BM at the Mall restroom!!!!!!

BM by Ben Dover November 7, 2003

BM 

mother of a man's child

don't trip, she ain't my girlfriend, she just my baby momma

BM by guru September 29, 2003

BM 

bitch-master (pimp)

That guy is a total BM; he has 3 girlfriends...RIGHT NOW!

BM by Cody Mau April 8, 2009

BM 

Best Man

courtesy of Charles Boyle from Brooklyn 99

"Jake is gonna pop the question, he's gonna ask me to be his BM"
"nope"
"BM- 'best man', it's a common abbreviation."
"No one but you has ever used it."

BM by Houin August 21, 2019

BM 

Breast Milk

"I just fed my baby BM"

BM by phx_zs May 13, 2010

BM 

1. Short for "Bat Mitzvah" or "Bar Mitzvah"

2. Abreviation for bowel movement...taking a shit

1. Wow her bm was great

2. Eww, her bm was gross

BM by Tom DeLonge_Lover July 20, 2008

bm 

An acronym for "butt mud," feces that are excreted from the body.

"There's bm all over the place, it smells bad.

bm by Nateoo March 17, 2010