1. [19C] a pint or half-pint pot [i.e. a small cat n.4 ].
2. [1900s] (US Und.) the junior member of a gang, used to check places susceptible to a robbery, etc. [dimin. of SE cat, but note cat n.1 (3a)].
3. a young woman [dimin. of SE cat but also play on cat n.1 (1c)].
(a) [1900s] an attractive young woman.
(b) [1920s+] (US black) a young, inexperienced girl.
(c) [1930s+] an affectionate term of address to one’s girlfriend or child.
(d) [1940s+] (US black) a girlfriend [a jazz-era coinage, plays on cat n.5 (1)].
4. [1990s+] the vagina [var. on cat n.1 (2a)].
SE in slang uses
see cat’s pyjamas n.
[20C+] to worry to excess, to throw a fit, to succumb to one’s emotions, to lose one’s temper, often through worry or fear.
[1900s] (US) something or someone exceptional.