A strike,slap or punch given by 'n South-African, Afrikaans White boer to let the opposing person pass-out, suffer a heart-attack, or possibly, die. The Boer Klap is often given to the children of Boerre if they miss-behave
Hein :"Dad, I soiled myself"
Ruan:"Son, I'm gonna give you one big-ass Boer Klap!"
Ruan:"Honey, call 911"