Top definition
The 'Bukmonster' is a name given to a sneaky Japanese pervert who derives pleasure from publicly masturbating- whilst sneaking up on clueless girls and ejaculating on them, usually aiming for their faces.

See bukkake
Girl A: 'Oh Shit run it's the bukmonster!'
Girl B: (turns head) 'Where?'

by Nolan Pettersen March 13, 2008
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