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1.
penis
slang word for a male penis.

"that man has a large purple headed mushroom!"
by Sammii J July 10, 2008
 
2.
another name for the penis, popularized in the movie "Varsity Blues"
"johnny's mom caught him strokin the purple headed mushroom with a playboy magazine yesterday"
by ScottScottKPT November 07, 2007