Green’s Dictionary of Slang

fireworks n.

1. [17C; late 19C+] an emotional outburst, a state of intense excitement.

2. [mid-19C] (US) guns.

3. [late 19C] (US) matches.

4. [1920s+] (US Und.) gunplay, shooting; in the context of war, a bombing raid.

5. [1970s] a police vehicle with flashing lights.