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1.
Trucker slang for a haz-mat (Hazzardous Materials) driver, such as a trucker with a tanker full of jet fuel.
Never ride in a convoy led by suicide jockeys!
by Justus February 03, 2005
 
2.
A maniac driver who overtakes on blind corners.
That suicide jockey has his days numbered.
by Pete November 10, 2004