Green’s Dictionary of Slang

1. (US) the female breasts.

1933		Nicholson & Robinson Sailor Beware! I i: Wanta see my idea of a swell-built jane? [...] How’s that for a shape? Looka them avocados...!
1975		L. Rosten Dear ‘Herm’ 149: Mr. K. is wearing new blinkers – not for reading but in tribute to her avocados.

2. (S.Afr. gay) the testicles.

2003

K. Cage Gayle.