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1.
A reverse beard occurs when a woman with an out of bounds muff sits on a man’s (or woman’s) face reverse cowgirl style. A person is more likely to be the victim of a reverse beard during the cold winter months, or when spontaneously hooking up with a partner who has been on a sexual sabbatical.
Yo, Stacy's bush is so grown out you could braid that shit. When we sixty-nined I had the reverse beard in full effect.
by Kenny Canstacker January 07, 2011
 
2.
A male or female that is used by their heterosexual same sex friend to act as if they are dating in order to give the impression that the friend is homosexual.
When I got to San Francisco I needed to pick up a reverse beard to avoid being discriminated against.
by GoldenGateLove August 21, 2013