Green’s Dictionary of Slang

pork v.

1. [1960s] (US) to shoot dead, to kill [fig. use of sense 1].

2. [1960s+] of a man, occas. woman, to have sexual intercourse; thus porker, n., a male sexual partner; porkee, n., a female sexual partner; pork pit, a place used for intercourse; pork time, sexual intercourse [pork n. (1b)].

3. see cry pork under cry v.

In phrases

pork out (v.)

[mid-19C+] to overeat massively.