Mouse potato defines as one who spends much of their time using a computer. 

The mouse part originates from the action of using a mouse to navigate or control actions on a computer. 

The potato part is much like a couch potato except for the difference of sitting in front of a computer versus sitting in front of a television. 

l'm just a teen being an aspiring writer (even if I like to procrastinate on the entire writing thing). My hobbies include: being a major geek, obsessing over bands, and killing off characters (oops)