Top Definition
1. (verb) To perform poorly in all situations.

2. For messing up in general
Dude, I got a 55 on that bio test, I so gamms that.

Man I got a 2.0 GPA this semester, I just gamms that up.

Shit I just swallowed my false tooth, my dentist is gonna be pissed that I just gamms that
by John Gammariello March 10, 2008

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