Green’s Dictionary of Slang

cat’s meat n.

also catsmeat
[the lungs and similar animal intestines are used for cat’s and dog’s meat]

1. [early–mid-19C] the human lungs.

2. [mid–late 19C] the vagina.

3. [late 19C+] (mainly juv.) a meat pie.

4. [late 19C+] (N.Z.) in fig. use, a term of dismissal or derogation.

In compounds

cat’s meat gaff (n.) [gaff n.1 (7)]

[1960s–80s] a hospital, usu. gynaecological.

SE in slang uses

In compounds

cat’s meat pusher (n.)

[late 19C–1900s] a street-seller of cooked horsemeat, presumably as petfood.

cat’s meat shop (n.) (also cat’s meat stall)

[mid-19C] (UK Und.) a restaurant.