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1.
A person who is obsessed with Nine Inch Nails/Trent Reznor.
Kelly is such a Nailhead; her room is covered in lithographs and she has every Halo on CD and vinyl.
by Chainmail92x November 17, 2009
6 1
 
2.
A Buick V8 engine from the 1950's. So named because the valves in the cylinder head are so small that they resemble nails.

An engine of choice for the Hot rod crowd.
"Dude, wicked hot rod! Whatcha runnin?"
"Nailhead."
by gtkane February 07, 2010
5 1