I have 4 step daughters, one of them is heavily into video games, fighting games mostly, like Tekken and Mortal Kombat types. If it were my choice she wouldn't get to play them so much. Unfortunately it's her mother's call, and being a democrat she doesn't monitor the games very well.
Dictionary.com will do. But you left out a hyphen. :)
Main Entry: souped-up
Part of Speech: adjective
Definition: mechanically modified to increase the power or attractiveness
http://dictionary.reference.com/search?r=2&q=souped-up