Mother With Benefits. Similar to MILF or Cougar. An older, motherly figure who can provide a partner (typically a young male) with the benefits of comfort, care, kindness and SEX.
Guy 1: Dude, I'm really missing home right now
Guy 2: Why?
Guy 1: Well, I miss my Mom's cooking and hugs and my girlfriend
Guy 2: Let's go to the Grocery Store and find you an MWB!
Guy 1: What's that?
Guy 2: A Mother with Benefits!!
by GrizzlyMan2012 October 29, 2010
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Midwest blood, a group of people who identify with Midwest based hardcore music.
Went to a house show in Chicago with a bunch of MWB bands.
by nyehhhsquidward November 20, 2017
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Memory Wank Bank (MWB). The content of a dude's head. All those pictures of chicks that a dude can call up from memory to assist in a good wanking session.
Dude 1: "D'ya see MILFy Sue bending over?"
Dude 2: "Fo shizzle, Dawg! Great ass. I could dig it!"
Dude 1: "Aye! One for the MWB."
by Wizards Sleeve September 16, 2006
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Main White Bitch.

Usually referred to someone who is black and is bestfriends with someone who is white.
Person 1: Who is that brunette with her?
Person 2: That's her MWB.
Person 1: MWB?
Person 2: Main White bitch. Her white Ride or Die
Person 1: Oh! Well her MWB is pretty hot.
by TMillieMil March 12, 2014
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