Guy #2: "Yeah! That idiot got drunk on sloe gin and went skinny dipping with Steph at Dave's party last weekend!"
Guy #1: "Indeed he did. I bet she gave him something he won't be able to scrub off with Ajax, Lava soap and an S.O.S pad! Hahahaha what a fuckin' dolt!"
2) swimming nude either with a large group or one other person, who usually is a hookup or love interest
3) swimming using underwear as a substitute for swimsuits, usually done with friends
2) "Hey babe why don't we spice it up and go skinny dipping tonight?"
3) Joe: "Hey I really want to go swimming right now but I didn't bring my trunks "
Jane: "Me too, but I don't have my bikini either"
Joe: "How about skinny dipping then?"
Jane: "Good thinking!"