I've only heard the term applied in two instances:
1) A guy who modifies (tweaks) their Honda Civics by attaching homemade oversized spoilers and noise boxes and think they are now driving some insanely great sports car. See Crazy Legs answer at this link for the typical example:
https://ca.answers.yahoo.com/questio...0204752AAwU13H (The young adult version of putting playing cards on your bicycle spokes.)*
2) a person who partakes in a certain banned topic
* yes, I know the more common term is "ricer", but I've heard this one more in Texas.