Green’s Dictionary of Slang

(Aus.) a derog. term for a female.

1987		K. Lette Girls’ Night Out (1995) 187: Surfers are an amphibious, beach-dwelling species, who hunt in packs for females with ‘margarine legs.’ You know, easily spread. Chicks are nicknamed bush pigs, swamp hogs, maggots, spitters or swallowers.
2001		D. Jenkins Money-Whipped Steer-Job 154: I’m just your average money winner out here who scores his share of pussy [...] and it don’t matter none to me whether they’re spitters or swallowers.