This occurs during the lake season while a girl, preferably in a small bikini, goes tubing. The previously mentioned girl is sitting up right and as the boat goes around a turn one leg slips off the side into the water and the other stays on giving 30 mph water a straight shot at her vagina, instantly cleaning it out of all dirtyness.
"Dude, Sam, did you see Kaitlyn get that instadouche at the lake last weekend?"
"Yeah I might actually eat her out now."
"Yeah I might actually eat her out now."
by youwillneverguessme February 17, 2012