A cup of some of the world vilest liquid. Usually served to inmates at Guantanamo bay to illicit a confession. Banned by most global organizations for extreme toxicity.
In popular culture, a keemcup has come to refer to a sexual position in which men repeatedly cum in the nostrils of the female, in reference to the putrid snot/semen mixture.
Yo me and my dawg keemcuped this ho hardcore.