Green’s Dictionary of Slang

(Ling. Fr./Polari) the number five.

1678		J. Ray Proverbs (2nd edn) 348: If size cinque will not, and deuce ace cannot, then quatre trey must.
1996		H. Young Lex. of Polari 🌐 chinker five.
2019		P. Baker Fabulosa 290/2: chinker, chickwa five.