Green’s Dictionary of Slang

gun-slinger n.

[all ‘shoot down’ their target]

1. [1920s+] (US, also gun-slammer) a gunman, esp. in the (fictional) ‘Wild West’; thus gun-slinger n.

2. [1960s] (US black) a sexually powerful man.

3. [1990s+] (US campus) a woman who rejects a man’s attentions rudely.

4. [1990s+] an employee dedicated to troubleshooting.

5. [1990s+] an aggressive male; a troublemaker.