Doppie Dop

South African term for when a person throws a bottle cap of any kind into his/her friends drink and then yells "Doppie Dop" in which that person has to down his/her entire drink no matter how full or empty the cup/container/glass is.

You are not allowed to throw to the person next to you or directly across from you.

Person 1: *Throws bottle cap into a persons drink*
Person 1: "Doppie Dop!"

Person 2 : " Ah you got me!"

Person 2 : *Downs drink*