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Used mainly in gay culture, it is an acronym for "kissing, sucking, rimming, and fucking."

It can be used, however, if your girlfriend likes her butt hole licked, or if she has a dick.
Guy One: Hey, bro. You wanna do a little KSRF today?

Guy Two: That depends... Your ass clean this time?


Girl: Hey, baby. Let's try a little KSRF tonight ;)

Guy: As long as it's you doing the S!
by CraigMania[c]! May 23, 2011