couch potatoe is a noun, meaning a lazy person. While I don't know the true origin of it, I suspect that came from lazy people who watch TV while lying down on the couch and eating food, often potatoe chips (or other carbohydrates) and drinking pop or beer. They are likely overweight and get very little exercise, other than hitting the remote control.
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MilkyAnd "mouse potato" is the equivalent for one who continually sits at the PC playing games and surfing.I just learned this one from one of our local guides in China two weeks ago. I think it's cute.