Green’s Dictionary of Slang

artillery n.

1. [19C+] (US) personal weaponry.

2. [1920s] (US, also field artillery) the female breasts.

3. [1930s+] (US drugs) equipment for injecting drugs [plays on shot n.1 (6b)].

4. [1930s+] (US) beans [beans, trad. and physiologically, are equated with the breaking of wind and are thus empowered with ‘shooting’ ability].

5. [1970s] the attractive female figure.

6. [1980s+] (Aus. prison) cutlery, which when metal doubled as weaponry.

In phrases

light artillery (n.)

[1920s–50s] (US drugs) a hypodermic syringe.