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slang A thong, a type of underwear or bikini bottom with a strip of fabric that goes between the buttocks (likened to dental floss between two teeth). How do people wear butt floss like that at the beach? It's so embarrassing! I could never wear butt floss—it's too uncomfortable.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See butt thong
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.