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1.
MBM
Mass Bowel Movement, when 5 people or more gang up and go take a crap in the same toilet so as to plug it up
-What's that smell?
-The janitors had an MBM because they wanted higher pay
-oh
by Chantecleer February 20, 2008
 
2.
mbm
Married Black Male, Married African-American Male. same as mwm but black. usually found in classifieds, etc
MBM looking for a MBW for a discrete hook-up.
by Chanticlear January 07, 2008
 
3.
MBM
Mildy Bellied Male- A phrase coined by Patrick Roberge, it's the response to "BBW", where the man is not fat or significantly overweight, but does still have a belly.
"I'm not fat, I'm a MBM!"
by creativexangst August 10, 2012
 
4.
MBM
Made By Man
That movie was so MBM.
by Shitgirlssay January 21, 2012
 
5.
mbm
mom behind me. Used in AIM to tell the perosn your mom or some one else is behind you and to keep converstion clean.
Bill: Lets smoke that weed on Saturday

Bob: MBM

Bill: wat you doin this weekend?
by Ryan March 11, 2005
 
6.
mexicans built my skool, the name of a skool
"omg mbms!!"
"i went to mbms"
by sammykinzandabster June 26, 2009
 
7.
mbm
Mates Before Muff

To choose your mates over a female
Mate, you should have gone with that bird and left me, mbm man.
by NickBell July 16, 2006