The act of never being satisfied with your car the way it is; thus doing every mod conceivably possible. Generally a trait adopted by avid car enthusiasts living at home with their mothers. They usually drive Hondas or Volkswagens & believe their car is worth $50,000+ more than its actual value.
Random Guy - Hey dude thats a pretty sweet Volkswagen you have, did you lower it?
Mod-A-Holic - Yea its on coils right now but im switching to air ride bro, I need to be lower