M: I'm going to meet Jon at the subway. You've met Jon, haven't you?
M: Yes. I want to drag him out to do something. You know, he's such a couch potato.
L：他是什么?Couch potato? 什么是couch potato? 他爱吃土豆?
M: No, couch potato is an expression used to describe someone who sits in front of the TV all the time eating junk food, such as potato chips.
L：噢，原来coach potato是指一个人老坐在电视机前吃零食。这个常用语挺有趣。那couch potato是不是只能指人呀?
M: Yes, it is only used to describe people, those who are lazy and unmotivated.