Green’s Dictionary of Slang

bollies n.

[abbr. ballocks n. (1)]

(Aus.) the testicles .

[Aus]Tracks (Sydney) Mar. 3/3: I always thought I was hot stuff with my lightning rod which can hang ten (on a warm day) and a fair set of bolles [sic] tucked into my okanuis [Simes:DLSS].