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1. MRB
Stands for: Men-Are-Bastards

A mindset in which a female or male temporarily or permantely believes that all members of the male gender are bastards, often due to a viscious break-up or negative relationship.
Jen was cheated on so now she's in a MRB mindset.
2. mrb
Mega Raging Boner, referring to yourself
Well i have a MRG baby!
by Manny Fresh Jun 26, 2005 add a video
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