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To take a dump. People use the expression grow a tail to say they're taking a dump, and if you know anything about GG Allin then you know that he would commonly take a dump on stage... hence the term I have coined 'GG tail'.
I had to find a bathroom quick so I could grow a GG tail.

I stunk up the bathroom when I grew my GG tail.
by Sarah Lambert March 03, 2008