a couch potato
Someone who often engages in sedentary activities, usually understood as frequently watching television. Lisa wants to date a man who loves to travel and explore, not a couch potato who watches television all the time.
a lazy individual, addicted to television-watching. All he ever does is watch TV; he's become a real couch potato. Couch potatoes can tend to become very fat and unhealthy, you know.
a couch potatoINFORMAL
COMMON If someone is a couch potato, they are lazy and spend most of their time sitting, watching television. Most evenings they sit, like a pair of couch potatoes in front of television. Most of these people are junk-food eating couch potatoes. Note: This expression is a complicated pun based on the American slang term `boob tube' meaning the TV, and the fact that a potato is a variety of tuber or root vegetable.
n. a lazy, do-nothing television watcher. (see also sofa spud.) If there was a prize for the best couch potato, my husband would win it.