Green’s Dictionary of Slang

1. a young woman, a girlfriend.

1964		A. La Guma Threefold Cord 33: Ah, come on, bok, just one.
1990		R. Gool Cape Town Coolie 11: The boks – the women, ’cepting old Malay bokkies, didn’t have no purdah!

2. an enthusiast; thus bok for, ‘up for’, game for.

1985

cited in J. & W. Branford Dict. S. Afr. Eng. (1991).

3. a hero, a masculine or athletic male.

1973		Y. Burgess A Life to Live (2002) 11: He was not, never could have been, any young girl’s idea of a bok, or charmer.
1975		S. Roberts ‘A Small Change’ Outside Life’s Feast 66: Good old Doug. He’s a bok for anything.