Green’s Dictionary of Slang

witboernaaier n.

[lit. ‘white Afrikaaner fucker’, i.e. fucker n. (3)]

(S.Afr.) a white racist Afrikaner.

[SA]A. Lovejoy Acid Alex 180: Fuck you Uncle Guvvie [...] fokken witboernaaier. [Ibid.] 397: Maa’tha poes fokken witboernaaier!: Your mother’s cunt you white Afrikaner racist fucker.