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
5 Words related to japenis

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