Mouse Potato

Huh, never heard of this word? Think of couch potato. A couch potato is a person sitting in the couch to watch TV all day long, so a mouse potato is a person sitting before the computer and using mouse all day long.

Don't worry about your vocabulary. It's normal that you don't know this word, because it was added into a Merriam-Webster dictionary this month. "Google" is added into this dictionary as a verb too. So, officially, you can google this word from now on.