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)
Further reading
If you take up texting and social media late in life, there’s a lot to learn! A twenty-something wants advice getting her dad up to speed on memes, Instagram, and animated images. Plus, when you’re on a long road trip, what do you call...
Sure, there’s winter, spring, summer, and fall. But the seasons in between have even more poetic names. In Alaska, greenup describes a sudden, dramatic burst of green after a long, dark winter. And there are many, many terms for a cold snap...