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1 definition by Papa knows best

 
1.
MRA
An "MRA" is a "masculinist."

A "masculinist" is "an advocate of male superiority or dominance" (Merriam Webster Dictionary Online).
Ergo, an "MRA" = "masculinist" is supremacis vermin with mommy issues and the urge to hurt, demean, and murder women.
by Papa knows best November 19, 2010