Green’s Dictionary of Slang

blacktracker n.

[play on SAusE black-tracker, a Native Australian used as an auxiliary police officer in the pursuit of criminals]

(Aus.) a nickname for a pious individual who is overly dependent on their spiritual adviser.

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[Aus]Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 17: BLACK TRACKERS [...] slang limited use. Nickname for religious people who are always running to their spiritual adviser [f]or assistance, advice or comfort.