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1.
Ladies who support and truly enjoy dirt motorsports and dirt track racing. Whether in direct participation of a related sport for hobby, recreation or career. Or simply the support of. Ladies not defined by a physical exterior.

Not to be confused with a "Dirt Bunny."

A clothing line.
"That lady was wearing her dirtbunnies sweatshirt this evening."
by Dirt Track Lady November 22, 2013
 
2.
A woman who dresses up in fox, monster or rockstar gear and attends motocross events for the sole purpose of pick up and fucking one of the riders.
Trisha wearing her fox jersey goes down to the local track every Sunday to find who ever took first place so she can fuck them, thus earning her the title Dirt Bunny
by mxz600rr June 05, 2012