What happens after having unprotected anal intercourse with a man with a tiny penis. The ejaculate doesn't get past the Anus Hotel lobby (so to speak) and coagulates very close to the one and only exit; occasionally causing a bloated feeling or general lower GI discomfort.
After they found him half naked with his scout master in the closet, he ran to that restroom so fast you just knew he was clenching chowder.
by Finn Gerbang January 06, 2015
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1 Noun. The clenching of the Gluteus Maximus.
2 Adj. A word used to describe a tense, awkward or painful moment. This word was used by Bear Grylls whilst making a dangerous descent down a rock cliff in Man Vs Wild.

Buttock-clenching is a phrase used by British people.
1 Buttock-clenching helps strengthen the Gluteus Maximus.
2 That fall looked buttock-clenchingly painful.
by JMUK July 13, 2012
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The act of catching a shart before it touches cloth, by tightly clenching one's buttocks to contain the inadvertently expelled matter. A successful stench clench, followed by an immediate stealthy bathroom visit, can save one from the ignominy of having shit oneself in public.
Damon and Bill watched bemused as Bob silently waddled towards the restroom, holding his stench clench tightly.
by Degenerate Scumbag March 26, 2015
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Definition: When a rape victim has clenched their butt before the rapist has a chance to penetrate them.
Example Sentence:

Dave: "Hey bro, last night I picked up a cute high school kid but he was totally pre-clenched!"
Catherine: "Ahhh shucks, maybe next time... keep it up!"
by WakeyWakeyHandsOffSnakey October 20, 2018
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A straight male who attempts to protect himself from rape by clenching his buttcheeks together. Can commonly be observed in prison showers.
Prisoner 1: Look at Billy over there... he’s clenching his cheeks real tight.
Prisoner 2: Must be cause he dropped the soap... he must be a clench defender.

Tyrone: Shit mayne... I’m still comin for that double-wide surprise *inhales* gawd dayummm.
by Pooperfuc420tits April 27, 2020
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When one man dips his balls into the partners anus and she clenches and rips the balls straight off and shits out the ripped off balls
The best moment of my life was when my wife gave me the rusty clench
by gjkljuhfvc February 17, 2017
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One of the sexiest things you could notice on a guy. When a guy clenches his jaw. It's not obvious. I just can't really explain it. It's just Really freaking hot.
"Today in math I was sitting behind this kid who i’ve known for over four years and is super attractive and he was doing that The Jaw Clench thing guys do with their jaws and I wAS LIKE ASDFHDLFJJDISLL PLEASE NEVER STOP DOING THAT

but I said it out loud and he knew so he turned around and did the clench thing like super obviously tHEN BIT HIS LIP AND SMILED AND TURNED AROUND AND I WAS LIKE NO STOP YOURE NOT ALLOWED TO MAKE ME SMILE LIKE THAT."
by KelleyGreen14 July 25, 2014
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