M.B 

Morning Boner.....Some Guys Find This extremely annoying... Other are happy cause it means you get to fuck in the morning if you have a gf or bf

Sister: Good Morning
Brother: Oh Shit
Sister: What's Wrong?
Brother: I've got a M.B that wont go away
Sister:Sorry Can't Help You In That Department

M.B by DragonBitch January 5, 2007

M.B. 

The rap name for this fucking tight ass rapper from M Mafia a.k.a. Martin Mafia.

Trigger friendly, Haters envy, Roll in a Bentley, This your boy M.B.,

M.B. by Martin B. June 11, 2006

M.B.A.M  

1.Money By Any Means
2.A Lloyd Bank$ song

I've been working my ass off for the past month,but u know what it is...!M.B.A.M

M.B.A.M by Phil9O February 17, 2009

M.B.Y.C.

"My balls, your chin."

"My balls, your chin."

M.B.Y.C. by The Original OG April 28, 2003

M.B.O.E 

My Brothers Over Everything

M.B.O.E we a fuckin family

M.B.O.E by KingYM May 26, 2015

M.B.N 

Acronym for MUST BE NICE. Usually used on Facebook when someone posts pictures of a fancy car or house.

Brian: Check out my $68,000 Honda

Joey:M.B.N

M.B.N by BAUWLUH August 21, 2011

M.B.K 

My Brothers Keeper

When my brother dies i will be his M.B.K

M.B.K by Ariel_Martinez April 10, 2016