1.couch potato: a person who spends a lot of time sitting and watching television 老泡在电视机前的人
2.later on: at a time in the future; after the time you are talking about 后来;以后;其后;随后
I'm going out later on. 我过一会儿要外出.
Much later on, she realized what he had meant. 过了好长时间,她才明白他的意思.