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1. When a fat person has an orgasm.

2. When a fat person gets sexual pleasure from staring at/eating/absorbing food.

3. When two fat people share an intimate love over a single food.
1. Wow, Zac seriously had a fatgasm.

2. Did you see the way Zac was staring at that hamburger? It's almost as if he had a fatgasm.

3. Zac and Cory had a fatgasm over a single french fry.
by mcdonaldsfan January 17, 2008
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