A racist term to describe cask wine when it is drunk by an African-American person. Usually the sack inside the box must be taken out for this term to be used. The word developed from the word 'Goon sack' or 'Goon,' also meaning cask wine.
Bettie: Fuck, I would kill for some fucking goon right now
Sam: Muthabitch me too!..... oh look, that homeboy over there has a Coonsack!