Stands for mom behind me. This is used when you are texting on the phone and u don't want the other person to send inappropriate language to you, the person behind you does not have to be your mom just someone you don't want seeing anything.
by allons-ycompanion March 13, 2015
Masturbate Before Messaging: A solid advice for men to curb the number of awkward /cringe-filled messages they send. Based on the fact, once ejaculation takes place, the man can start thinking with his brain, again, getting rid of the libidinous urges.
Joe: Dude, I'm texting this girl I met at the supermarket. What should I say?
Matt: Whatever you say, remember to MBM.
Matt: Whatever you say, remember to MBM.
by Internet Human August 06, 2019
by EV514 January 03, 2010
Message Board Misunderstanding: Used to connote sarcasm on a message board, or to apologize in advance to whomever you might offend...
by Ms. Topaz September 09, 2005
by NickBell July 16, 2006