An acronym standing for "Girl We All Mack'd".
Derived from a group of friends who realized they had all made out with the same girl at one point or another in the same night. Now colloquially used to describe a slut.
Maddiee you were gwamming hard last night!
Dude check out all the GWAM's at this party!!
...That awkward moment when you realize she was a gwam
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