Green’s Dictionary of Slang

kraak v.

[Afk. phr. gaan dat dit so kraack, ‘go like the blazes’]

(S.Afr.) to speed, to go fast, esp. on a motorbike.

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[SA]C. Hope Ducktails in Gray Theatre Two (1981) 36: When I was a lightie I didn’t even have an autie. When I wanted to kraak down the town I had to battle some start off my old queen [...] so’s I could get the bladdy bus.