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1.
Enthusiast of petrol (gasoline) engines or cars
Petrolheads may prefer the gasoline version of this automobile to the diesel one.
by Anonymous October 15, 2003
 
2.
Someone who is totally obsessed with motor vehicles.
Won't that petrol head shut his motor mouth?
by ud40 March 04, 2005
 
3.
Term of abuse used by environmentalists against car users.
"The petrolheads may soon run out of road; gridlock is certain in many areas by 2005"
by Nupe January 07, 2004