Green’s Dictionary of Slang

honk n.5

[Du. honk, one’s aim or target, that which has to be done]

(S.Afr. prison) prison work detail.

[SA]A. Lovejoy Acid Alex 210: Time to go back to my section and do my honk [...] I’ve got the exact same type of honk as in Dassie Bult. I do the bathrooms.