lox jock, n. — Green’s Dictionary of Slang

lox jock n.

[Yid. laks, thence SE lox, smoked salmon, served with cream cheese and bagels, a favourite Jewish dish]

(US) a Jew.

1977

(con. 1949) J.G. Dunne True Confessions (1979) 34: ‘Jew,’ Crotty said [...] ‘Ever notice, the guys with the cushy jobs, they’re all lox jocks.’.