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1.
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.
by KeemcupExtr3m3 October 18, 2012