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1.
After ejaculating, semen is left inside the urethra. After some time, this seminal fluid hardens causing disturbed urinary patterns.
I was aiming for the toilet but due to an excess of cumcrete I urinated all over my pants.
by Jackstain October 08, 2009
 
2.
Dry semen left on a countertop after masturbation.
My roommate is a bastard. He left cumcrete on the bathroom counter by the toilet. I thought it was toothpaste until a tried to wipe it up with a wet cloth and almost puked from the smell.
by Dr. Robstew December 19, 2012