a Rost is when a South African family participates in a wild and violent incest party at home, this includes violently penetrating the youngest anus with a tribal pattern engraved wooden pole. This normally includes about 6 family members who are all the result of years of incest, the leader declares when he wants Rost by violently shouting "RHOST" as it is traditionally pronounced, when yelled the family knows what they are in for and immediately cancel any plans that they may have made as rost can last anywhere from 4 to 16 hours. to cover up and disguise the illegal act of Rost, the family refers to it only as a "roast", when someone asks about it. As mentioned before during a Rost the dominant male leader initiates the Rost by penetrating the youngest anus with the wooden tribal pole, after this the whole "incest born" group begin to violently bash and penetrate each other, while indulging in a feast. Rost is the result of a practice passed down from thousands of years ago in south Africa where it originated from in the Xhosa tribe, here the tribe leader, a black mandingo with genitals that usually measure a minimum of 13 inches THICK, performs a Rost ceremonial once every Saturday night, by doing this he not only shows off his aggression and dominance but also warns any other tribes in the area not to fuck with him.
friend of incest family member: hey man wanna come out tonight ?
rost victim: nah man you know its Saturday and im having a family "roast"