Hahaha.
Well, according to Urban Dictionary, a haack is:
A complete loser who generally plays in his/her high school band and sits at home when not busy doing homework or practicing BLOWING into their instrument, by playing video games all day.
But I doubt that's what you're going for...HOWEVER!
Leon is by far the sexiest person in the car. Leon is someone who could play video games all day. Leon is a haack!