from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang A person who spends much time sitting or lying down, usually watching television.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A person who spends a lot of time sitting or lying down, often watching television, eating snacks or drinking alcohol.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an idler who spends much time on a couch (usually watching television)
couch + potato; coined by Tom Iacino in 1976 as a pun on "boob tuber" (boob tube = television, tuber = potato); trademarked by Robert Armstrong 1976–91 (Wiktionary)