Uncommon Abbreviation

I've become fairly versed in abbreviations over the years but recently one was brought to my attention that blew me away.

A guy calls in complaining about his "bm." Now I'm thinking, bm, bm, what could that be? Bowel movement - wouldn't be the strangest thing I ever heard. Possibly best man - maybe he's getting married. Buttmunch - maybe he's a Beavis and Butthead fan. But no, I could not have imagined his explanation - bm=baby's mama.

Not only should this phrase NEVER be used, but abbreviated, that is taking ghetto slang a little too far.