Green’s Dictionary of Slang

apples n.

1. [17C+] the female breasts [the rounded shape; the term has survived but became more a euph. than sl. by 20C].

2. [19C+] the testicles.

In phrases

how do you like them apples?

see separate entry.

like two apples in a bag (adj.)

[1950s+] (orig. US) a ref. to well-formed buttocks, irrespective of sex.

love apples (n.) [note Fr. pomme d’amour; Ger. liebesapful, the fruit of the tomato]

[late 18C-19C; 1980s+] the testicles.