Green’s Dictionary of Slang

(Aus. Und.) the last of anything; the only example.

1900–10

Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 1: ABE: slang last of anything, only one. push and thieves – this is my abe – that is to say, my last or only coin, pipe of tobacco, etc.