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The scientific process of semen evaporating.
"There is barely any cum in the condom from last night, damn cumdensation"
by B-wake March 30, 2013
When the temperature is so high that a man's semen beads up and sweats through the shaft of his penis to cool it down.
"Man I'm not used to this southern weather, there was so much cumdensation on my dick when I woke up!"
by Rouzay November 15, 2011