The act of fucking a man or woman who has been fucked and internally ejaculated into by no less than 3 previous parties in a 30 minute period.
"That bitch was a total muck fuck!"
or
"I's about to be gettin' meself into a serious muck fuck, Argghhh!"
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When a man with a cock length of 11 inches or longer uses a beer koozie around the base of his penis to cushion the extra yardage that wont fit into a girl's pussy. Both useful for the man and the woman.
"That bitch was so short I had to straight up koozie cushion!"
or
"Baby, Im gonna have to Koozie Cush yo shit."