Top definition
An extremely small penis, a contraction of "japanese penis," which are known to be extra tiny.
Girl 1: How did your date go last night?
Girl 2: It was great till we got back to his place. I wanted to hook up and I pulled off his pants to see that he had a japenis...I was totally disappointed and I left.
by Smart Money May 01, 2006
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2
A japenis is preferring to a small Japanese dick of penis. This includes anime.
by Aspen gray January 28, 2017
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