Green’s Dictionary of Slang

pork chop n.2

1. [1920s+] (US) an attractive young woman [? pork chops n.; or she is ‘good enough to eat’].

2. [1940s] (US) a dollar [image of money as a staple of life].

3. [1970s+] (US) a black person who, despite supposed advances in equality, is willing to accept an inferior position to that of whites; also as adj. [the stereotype of pork chops as a staple black food].