whale tail
n.— «Whale Tail: The top rear strap of a woman’s thong, which closely resembles a whale’s tail rising from the water whenever the wearer bends over or squats.» —“Re: OT—For jb’s eyes only” by Cliff Huprich Usenet: alt.machines.cnc Jan. 26, 2004. (source: Double-Tongued Dictionary)
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