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
Man: Baby, it took forever to pop my cumplug
after so much hot lovin'.
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.
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.