Green’s Dictionary of Slang

hind fist n.

(Aus.) a leg, a foot.

[Aus]Bulletin (Sydney) 5 Oct. 26/2: In round seven the darkey, absolutely at the last gasp, clinched continuously, till the ‘gintlemin from the bate’ stopped the scrap, and the referee declared it a draw. Then the crowd reared up on both its hind fists, and with hoots and curses, threatened to disembowel the referee [...].