Also found in: Acronyms.
vulgar slang Someone who lies still, shows no emotion, and comes across as disinterested during sex. Don't just lie there like a dead fish! Communicate with me—tell me what you like. She was so sexy in the club, but, to be honest, she was kind of a dead fish in bed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.