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13.
MB
An acronym standing for Marching Band. Used by people online when messaging people publically,such as MySpace or Facebook, to avoid the criticism or questioning of other people.
James: Hey Mike are you doing MB next year?
Mike: I can't, I'm joining the football team.
by -=[DeTeRMiNaTioN]=- August 04, 2009
 
1.
MB
MB: (Medium Boto)- Someone who evolved from “SB” (Small Boto) to “MB” . A “MB” has more than 1 chic and wants to lose their v-card to any girl, but no one wants to fck him .
MB: "I like lose my v-card before I leave ."
C1: "Why?"
MB: "Cause I like practice before I come there."
C1: "What about c2, thas yo chic."
MB: "Naw, she’s just another girl, I still finna talk to her tho for practice ."
by ") . July 07, 2010
 
2.
mb
a shorter version of My bad
Joe: ur a bitch
Sally: No im not
Joe: Oh ok mb
by Joeness August 07, 2007
 
3.
MB
MB stands for megabyte, or 1 000 000 bytes.

Not to be confused with:

- Mb: Megabit (8 megabits = 1 megabyte)

- mB: Millibyte (theoretical)
- mb: Millibit (theoretical)

- MiB: Mebibyte (1 048 576 bytes)
- Mib: Mebibit (1 048 576 bits)

Capitalization matters!
That guy: the file is 5 mb
Me: You mean 5 MB?
That guy: ya whatevr
That guy: ur pedantic
Me: ...
by Shirayuki-hime October 14, 2007
 
4.
MB
mb = Maybe.

A shortening that has occurred due to lazy internet gamers not being arsed to type in 3 more letters.

Often used in conjuntion with 1337, leet, omg, wtf and other internet gamer words.
Conversation between two gamers:
1st Gamer: So did you own him?
2ndGamer: No his rail aim was uber leet :(
1st Gamer: You gonna hack his computer then?
2nd Game: mb
by Sam Fold April 13, 2003
 
5.
MB
short term of masturbate
MB is the best policy
by assholefreakybastard March 08, 2011
 
6.
MB
The need to 'spank the money' or 'choke the chicken' & etc AKA Masturbate.
Guy: "I haven't MB'ed for a long time.."
Dude: "LOL, GROSS.."
Guy: "Joking, I do it for the lulz."
by waszupRapper October 14, 2009
 
7.
MB
Morning Boner, Usually when a man wakes up in the morning and has a massive erection.
Man, I've got a huge MB right now!
by MurrDan August 04, 2005