whale tail
n.— «Another distraction occurs when pants ride low in the back and expose thong underwear, a phenomenon students have dubbed “whales’ tails.” “If you a 16-year-old boy in an English class, and you’ve got three whales’ tails in front of you, it’s pretty hard to concentrate on verbs,”» —“Updated Dress Code Addresses New Styles” by Tom Quinn Oregonian (Portland) June 24, 2004. (source: Double-Tongued Dictionary)
Further reading
When a teenager went a week without talking as part of a school project, he noticed a surprising side effect: Instead of rehearsing a response to what other people were saying to him, he was focused on listening — and feeling smarter as a result...
Lydia in Portland, Maine, was texting someone about having seen an opossum, but wasn’t quite sure how to write that out with the article. Is it a or an opposum? Like most Americans, she drops the initial unstressed syllable, making it sound like...