Ever wondered where the term came from?????
From couch + potato; coined by Tom Iacino in 1976 as a pun on "boob tuber" (boob tube (“television”) and tuber (“potato”)); trademarked by Robert Armstrong from 1976–91.
I get boob tube, TV, but don't get tuber.
The tuber is the root of a potato plant.
I'm kind of a couch potato. Like to watch TV and computer.