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Inverted Porcupine 

Slut - meaning if you inverted a porcupine, there would be a lot sticking in as opposed to sticking out - see Pin Cushion
That broad is a total inverted porcupine...

porcupine's balls 

Shaved Balls that are starting to grow hair back on them.
His porcupine's balls were sticking me like crazy last night while we was bumpin uglies.
porcupine's balls by KateHear September 4, 2006
A bald-headed man whose hair has started to grow and become scratchy or spikey.
That porcupine needs a haircut bad!
porcupine by Valinda November 1, 2006
when you fuck on a bed of nails doggy style (usually a blonde, if not a red head). a full porcupine is when u shave her legs after sex (if her legs are not shaved it is only 1/2 a porcupine)
porcupine by fuck myster June 6, 2008

Dirty Porcupine 

When for whatever reason you have stiches on your penis and you have anal sex with some one.
DUDE! Lastnight i totally got these stiches just so i could give people dirty porcupines.
When a guy spikes out his pubic hair, like a porcupine's needles.
Damn Tang, Your porcupine is stabbing my hips again
porcupine by the jay April 27, 2005