Green’s Dictionary of Slang

(US) a policeman.

1959

Murtagh & Harris Who Live In Shadow (1960) 53: Look, you puny policemen, you can try stretching my noodle from here to kingdom come but you ain’t gwine get word one out’n my mouth [...] Well, one of them Rover Boys, he says, ‘I got news for you, kid.’ [Ibid.] 188: Rover Boys – The cops.