From the movie "Deuce Bigalow: European Gigalo". It is used to describe the sex act of dipping your cock into a pile of jizz, covering ur cock in white jizz making it look like a snow cone hence the name, then stuffing ur snow cone cock in a girl's mouth or vagina.
Ronny: "whats up partnah"
Dave: "Check this shit out. I gave that skank from last nite a Turkish Snow Cone in my jeep"
Ronny: "No shit, what a whore"