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1. A noun, purpura is male genitalia that is all testicles and no penis or a very small penis overshadowed by deformed balls.

2. A deformed penis.

The word originated in New York amongst Italian kids who would make fun of a kid with a deformed penis and grew to describe some with "all balls and no shaft"
"I heard Carol left John because of his purpura."

"Scott's purpura keeps him from getting any"
by LargeMouthBasshole December 23, 2011
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