Define Boerish Behaviour Meaning

Boerish Behaviour
1: Acting like a boer
2: Favorite catch phrase of my South African headmaster, whose pet crusade was (ironically) to stamp it out in his school.

(English colonel, pith helmet, socks up to the knees, comb tucked into one sock, to scruffy colonial children): I say, look here you! Less of the boerish behaviour, if you please, or it'll be six of the best, trousers down, and no pudding for you tonight!
By Gale