Top Definition
Whilst your woman is giving you oral sex your pubic hair rests on her upper lip, giving the apperance of a full, lush, moustachio. The reason many men shave their pubic hair is to reduce the bj moustache effect.
Mid-Fellatio: You know what? You look good with a moustache.
-Now that's a bj moustache!
by Hlnahomey June 28, 2007
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