Joe: ur a bitch
Sally: No im not
Joe: Oh ok mb
by Joeness August 8, 2007
CptStone324: GOD WTF
AlphaX: mb lol
by T Hizzle May 3, 2005
Mage Bank in RuneScape. People say they're mb pk'ing when they are player killing in the wilderness at the mage bank.
OMG! I just owned a noob for whip at mb!
by Gre8est_Sk8r January 7, 2007
Masturbate or Masturbation

Also can be said, "MBing"

MB is the not so secretive act of:
a. inserting a hairbrush, remote, or dildo into the pussy (ass)
b. using a toothbrush on yr clit
Kelly MBed with her stepfather's toothbrush.
Liz MBed in a Methodist Church once!!
by NatureLover111 October 18, 2006
An expression when you'are a shitty player in the KVLT game : Starcraft.

MB = my bad
Player : What kind of jerk are u? What are u doing ?
Noob : mb
by Pornocio September 28, 2006
major boner!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

can be used from looking at a guy/ girl to one's arousal
after looking at her, i had a mb!
by mikerules111 February 26, 2007
‘mb’ is a Chinese abbreviation which stands for ‘money boy
你是mb吗?
Are you a MB?
by Haohan December 30, 2019