Where a large bellied individual raises his or her stomach and allows it to drop upon his or her sexual partner in a way that creates a *smack* sound. This is an act performed for sexual pleasure.
Man, my back is killing me from a night of gut flopping with your mom.
by Barringo November 10, 2007
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When people are sexually going off then an obese person will raise their stomach and flop it in their partner so it makes a large SMACK noise😂 It's weird ik lol
It was so weird he just started gut flopping me, I've never been with anyone whose done that before
by Imma.holo.sexual January 29, 2017
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