Top Definition
when your penis shrinks after taking cocaine or speed
I got really bad billy willy last night. did you?
by polsky November 23, 2007
5 Words related to billy willy
billy willy is when your dick is so small and unfunctional because the "whizz" (cockney rhyming slang) "billy whizz" = speed has done what it enevitably WILL do to your bulk of your manhood :D
"oh fuck love, i got billy willy"
by Jobie1 ;) October 24, 2004

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