1 definition by Byrn entrees

Incumin

while having upside down sex right as the male is cumming he drops her on her face

so steve is in gravity boots (the boots that you hang from a door fram and hand from) naked and his gilr friend comes along and says "can youi have sex upside down,"and steve says" lets try"
so right as steve is about to cum he says "incumin" and drops her on her face

by Byrn entrees December 31, 2009