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...

Inverted Porcupine by BahamaBoy June 21, 2005

Inverted Porcupine 

When someone has more dicks inside of them then outside of them.

"Man, Pierre is so gay he's like an inverted porcupine; he's got more dicks inside than outside!"

Inverted Porcupine by Yer mommer n' 'em July 17, 2025