A.B.M. stands for "All but married." Similar to A.B.E., A.B.M. may denote that a couple is engaged, but not yet married. In particular, it may denote a rather long engagement period, but not always. See example (1)
Other times, it may be used as a loose synonym for A.B.E. and may or may not denote behavior between a couple that is more serious than expected at an early stage of dating. See example (2)
Similar to the academic lingo, A.B.D., All but dissertation.
1)
Ellie and Stew are A.B.M.; they've been engaged for three years!
2)
Jay: Zack is A.B.M.
Frank: Yeah, I hardly ever see him anymore since he started dating Kim.
Witness me ridin' dirty, straight up jocking,
No need to get flirty, they be cock blocking,
I be with your gurlies, straight up mocking,
Rocking, Clocking, Knocking, Flocking.
B.M.A.B.C., bitches.
Witness me ridin' dirty, straight up jocking,
Ain't need to get flirty, they be cock blocking,
I be with your gurlies, straight up mocking,
Flocking, Rocking, Clocking.
B.M.A.B.C., bitches.