From the Dutch phrase "Voort seg ik!" literally meaning "Forward say I!". It was then adapted by South Africans into voetsek, and then eventually "footsack" in English.
It was originally meant for dogs, but is now fairly commonly used against people as well, although in this context it's meant as a light-hearted "fuck off!"
The most common variation is the abbreviated "tsack", or the colloquial "tsek".
When you get slapped by a foot. In a slapping motion of slappy-ness. It is not a kick. It's A Slap. Of The foot. The foot-slap is usually used on the thigh, or foot.
Gay: Ouch! Why did you footslap me!? (On My Leg)
Guy: Cause you licked my omelette biatch!
A personwho is lucky enough to devote his life to worshiping his mistress' feet. He lives only to serve her feet.
Gemma had loved having her own footslave, she teased him, she whipped him for not licking her toes properly and she tortured him. But he loved being under her sweaty feet all day as he had a foot fetish.