Big Mouth Make-out.
You're at the bar late, you've been talking to a boy/girl for a while, you both know what's going to happen, but you're a little tipsy so you're not sure the mouths are going to match up, so you just plunge into the BMM without a care for who sees it.

Johnny didn't care who saw it; he and that girl were just BMMing last night.
by concernedhoya January 08, 2010
BMM is the acronym for beat my meat.

Also see BYM
Guy 1: Man, I'm so stressed out. I need a release. I'll just see how fast I BMM.

Guy 2: BMM?

Guy 1: Beat my meat!

Guy 2: ROFLCOPTER! Have fun with that...O.o
by JSwanson1025 April 28, 2009
boner making machine

A girl that is super attractive and is the epitome of every man's dream.
Caitlin is a total B.M.M.
by RTP2011 January 05, 2011
Black male magnet. Can also mean fat chick or anyone that attracts a high volume of black men.
Lisa has such a big bootie. She is a total BMM.
by shadycat August 12, 2007
(noun) Baby Making Music
Having planned hours in advance for his night with Jessica, John had conveniently grabbed his BMM and stuck it in the car stereo.
by meghanwrotethis November 07, 2007
Bread-Meat-Mayonnaise sandwich

when you dont have cheese or just want a quick sandwich
Used Often in Florida
Man i Want me a BMM right quick, im hungry.

Hey Baby, Make a BMM please
by Elfresh December 09, 2009
Blows My Mind
Used in IM conversations, forum postings, fbook, texting, etc.
Not for use in daily speech.
The new Tokio Hotel album completely bmm.
The fact she would do such a thing bmm.
That eye rape completely bmm.
by OnceUponAKaulitz January 09, 2010

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