Green’s Dictionary of Slang

1. (US) the mouth.

1938

R.L. Bellem ‘Grappling Trilby’ in Popular Sports June 🌐 Reilly [...] smites him an elbow-smash upon the cafeteria.

2. (US gay) anywhere that plays host to repeated oral sex, e.g. a public lavatory or bath-house [one goes there to eat v. (4)].

1988

H. Max Gay (S)language 7: Cafeteria — repeated fellatio in backroom, bathhouse, or toilet.