Common bathroom occurrence amongst females. When you are getting ready to urinate and there is someone that unexpectedly goes into the stall next to you. You clench up your nether regions to stop a possible loud tuft of air from escaping.
I had to pee soooooo bad earlier! Jasmine walked into the stall next to me right before the grand release and I had to do a coochie clench so I would not embarass myself.
by MDermy August 23, 2010
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Excercise where you clench your butt repeatidly. If done regularly and very OFTEN it results in a very fine firm ass!
I did thousands of butt clenches a day for this sexy tight ass!
by Nallis December 8, 2006
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When someone attempts and fails at performing a donkey punch, the reciever tightens their orifice in honor of the effort given by the donkey puncher.
Rob tried donkey punching me last night, but the dumbass hit my shoulder. I gave him a courtesy clench just to make the poor bastard feel better.
by JOKRGUY2012 October 10, 2010
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noun: The facial contraction that a person has when they are trying to squeeze out a turd.

verb: The act of contracting your face and gritting your teeth while you are squeezing out a turd.
My friend commented that my dump clench seemed rather intense and that perhaps I should eat some more fiber.

My friend walked in on me while I was pooping and saw me dump clenching.
by MasterChiefsBalls February 8, 2011
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The act of tightening one's butt cheeks to impede the release of a shart.
Because of his successful shart-clench his pants remained stain-free.
by CosmicCareBear October 9, 2013
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1. To squeeze your butt-cheeks together so hard that you are forced onto your toes and your khakis become floods.

2. A popular dance move where one abruptly clenches his/her cheeks, shoots up on their toes, and lets out an MJ scream
Babe #1- "Wow things got pretty aggresive back there. Did you see Joey doing the Khaki-Clench?"
Babe #2- "Sure did. The old Khaki-Clench"
by RagDale February 10, 2011
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When a girl contracts her groin for pleasure because she can't properly fud herself as the situation is too public or she is just too tired.

Often referred to as a minge twinge
Example 1:

Man, Dave Grohl's pretty hot. Pretty damn hot. I'll just have a cheeky groin clench over him as there's way too many people on this damn bus to get proper involved with myself.

Example 2:
A: Girl, you want to get out of this club?
B: Babe, I'm groin clenching at the though of it!
A: Oh Baby! Hummuna Hummuna!

Example 3:
That boy in that advert is pretty hot. I think he deserves some special attention but it's been a long day so he'll just get a groin clench or two.
by VIPizzle April 4, 2011
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