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1.
Hipsters of the automobile world.
Guy 1: I need a car for my wife and kids, any suggestions?

Pistonheads: mx5.
von Garlick 22. Juni 2013
 
2.
(n.) One who is very interested in the mechanics of vehicles, particularly luxury or sports cars. Similar to a gear head
The only thing more boring than a piston head is a gear head
von Gumba Gumba 23. Mai 2004