Top Definition
a sexual fetish for individuals who dress up in a bunny costume of some sort (usually a sexually enticing one).
Hugh Hefner is totally into Bunnism.

John: I love it when my girlfriend puts on a bunny costume.
Mike: Like one of the Furries?
John: No a sexy one with ears and a tail, even better in lingerie.
Mike: You got a fetish for bunnies or something dude?
John: Yup and it's called Bunnism.
by itzmzbunny February 27, 2013
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