Green’s Dictionary of Slang

(orig. Aus.) a homosexual man.

1984		J. Green Dict. Contemporary Sl. 281/2: tan-tracker n. (Aus. use) homosexual male.
1986		B. Hudson First Aus. Dict. Vulgarities n.p.: tan tracker, an aggressive homosexual.
1992		Aldrich & Wotherspoon Gay Perspectives 44: Ride the tan track and tan-track rider and dirt-track rider are only marginally less blunt. The same idea is involved in the variants on chocolate.