Green’s Dictionary of Slang

(N.Z. gay) a sex worker who ‘goes in/to’ the client’s car for sex.

2010

W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 76: Originally cargo (car-go) was a street term. It described a prostitute who had sex in a client’s car. Thus one might hear a comment like, ‘I wouldn’t pick up that thing. It’s damaged car-go. It’s lucky to get one puncture a night’.