Green’s Dictionary of Slang

berkeleys n.

[Rom. berk, breast]

the female breasts.

[US] (ref. to 1890s) H. Rawson Dict. of Invective (1991) 387: Among the others in this collection [F&H]: bubbies, charlies, blubber, butter-boxes, berkeleys, diddies, globes, dugs, and ‘charms’.