Commonly, after a male finishes urinating, he pulls the front half of his briefs back over his groin and goes about his daily routine.
A Turtle Snap occurs when the male loses grip on his underwear halfway up, causing the elastic to snap directly onto the genitals. Side effects may include severe pain in the testicles, depreciation of self-esteem stemming from the brief inability to use basic motor skills, and strange looks from anyone occupying neighboring stalls.
Over-exposure to Turtle Snapping is likely to result in a Schlonky Donk
Bryan: Hey Mike, why are you doubled over?
Mike: I was so relaxed after my urigasm that I turtle snapped myself.
Bryan: Cool story, bro.