A sex act involving one person laying one their back, lathering themselves in lubricant, after which another person performs a (usually large) jump onto the person covered in lubricant in an attempt to slide over the entirety of their body.
Tom: "Bro, did you hear that Sam flooberflopped Alex last week?"
Harry: "Yeah, he said it was like a slip n slide!"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi