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1.
Someone who avidly enjoys watching Motocross. The term has also been used to describe "cheap seats" at Motocross events. ("Treadhead seats")
Jake has been to 12 Supercross events! He's a real treadhead!
by MustangGT September 25, 2005
 
2.
when cornrows go bad: the hairstyle worn by devotees begins to look less fierce and more like the balding treads on a fading car tire.
Allen Iverson's hair looks treadheaded.
by misosoup January 30, 2007
 
3.
A person who is fond of or has a fascination with armored fighting vehicles.
Joe went crazy at the Imperial armor museum when he saw the German tanks. He's such a treadhead.
by jmt_tx May 14, 2009