Green’s Dictionary of Slang

1. (S.Afr. Jewish) an Afrikaaner.

1983		letter in Branford & Brandford Dict. S. Afr. Eng. (1991) 101/2: Chattes — [...] is used by SA Jews as a derogatory term for Afrikaners.
2006		Bolton & Krachu World Englishes 155: gattes (a derogatory name for an Afrikaaner).

2. (S.Afr.) a policeman.

1977

P.C. Venter Soweto 153: Die gattes - the police.