Top Definition
A penis so small that it's actually only the head, with no shaft whatsoever.
Masturbation would be so much easier if I didn't have an acorn penis.
I think penis size is passed down from generation to generation, so if I have a child, he will have an acorn penis for sure.
I would really like to wear my new speedo to the pool, but there are ladies there and I have an acorn penis.
by Magic M December 16, 2006
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