Top Definition
1) noun. When a woman deepthroats a guy's dick and his pubes rest comfortably on her upper lip, thus giving her a boner moustache

2)noun. When a man trims his pubic hair so that it looks like his boner has a moustache
1) Paris Hilton totally had bonerstache when she deepthroated that guy's dick in her sextape

2) I bet Burt Reynolds trims his pubes into an awesome bonerstache for the ladies
by RMAZ123 July 11, 2011
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