Green’s Dictionary of Slang

testicles.

1971		N. Smith Gumshoe (1998) 61: What about that shot Pele hit from behind the half-way line, eh? Made that goalie drop his ollies.
1977		A. Bleasdale Who’s Been Sleeping in my Bed 20: Robbin’ crab apples, six years old. The bastard made us sit there an’ eat them all. I was crappin’ little green ollies for about a fortnight.