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1.
After masturbation when semen starts to thicken and dry in the head of a mans penis, and he attempts to urinate and is surprised by an uncontrollable stream of piss.
So I whacked off in the shower, and when I got out and went to take a piss, I accidentally pissed on my foot due to a cum-clog.
by Nexrow November 04, 2003
 
2.
A whore or gay guy who has been "filled" so much they have become clogged, in the throat or they have ass clogged.
"Haha look at the ass pirate work like he has a cum clog, his boyfriend really topped him off."
by Jack Meoffe November 24, 2008