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two gay men having anal sex with one another during the same sexual encounter, in which they both take turns being 'top' and 'bottom' with eachother, before cumming.

this is not to be confused with being 'versitile', because versitile men can top or bottom depending on their mood. if they do both in the same night, with the same partner, and the partner is doing the same with him, that is a flip flop.
"i flip flopped with that guy for hours, until we both came on eachother! i love flip flop sex"
by peopie July 06, 2008
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