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The hardened deposit of semen left in the male urethra after masturbation or intercourse. Usually formed when one doesn't "clean the pipes" after such activity resulting in a temporary blockage that can lead to random urinary problems and sometimes temporary pain.
Dude, I forgot to piss after whackin' off and now I got a wicked cum-plug. I just accidentally pissed all over my bathroom.
by Seamoss May 06, 2007
The dried seman that accumlates at the tip of man's urethra after sex. During the man's first post-coital urination, the urine stream will go in erratic, unpredictable directions until the cumplug is burst.
Woman: Why is there piss everywhere?

Man: Baby, it took forever to pop my cumplug after so much hot lovin'.
by fozter November 10, 2009
The wad of dried cum in a fag's ass after a good butt poundin'. A petrified cum plug can cause constipation.
Bruce was backed up for a week after he let Carl's cum plug petrify in his asshole.
by Anal Czar September 18, 2010