Green’s Dictionary of Slang

(S.Afr. township) a gangster.

1977		P.C. Venter Soweto 153: A stranger to the tsotsi’s dangerous world could save his throat if he has some knowedge of basic words and phrases: Sy line met die rawurawu – she goes out with thugs.
1979		A. Brink Dry White Season 87: Your sister lines with the rawurawu, the gangsters.