Top Definition
A form of analingis that occurs between two partners, in which both partners lick each other's anuses.

basically, it's like 69ing, but with buttonholes-- a double rim job.
My girlfriend was giving me a rim job and wanted one too, so to make it fair, we started Six Eighty-nining.
by woahnow February 13, 2014
5 Words related to Six Eighty-nining

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