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1.
a GPK (a Garbage Pail Kid) is a sexual act in which one person penetrates the other up their butt, while holding their head in a bucket, or other large container, of vomit.
This girl I dated was into vomit, and last Tuesday, she asked if I'd give her a GPK (a Garbage Pail Kid).
by youppi November 17, 2011
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