Green’s Dictionary of Slang

(Aus.) the testicles.

1972		B. Rodgers Queens’ Vernacular.
1999		G. Seal Lingo 88: The extent and variety of the Lingo terms for genitals and other body areas hints at a determined, if perverse, use of euphemism [...] Such terms, though, seem sterile and colourless to the Lingoist who prefers such delights as [...] crackers, orbs, prick, dick, old fella, tossel, stalk, throbbing gristle.