The puckering effect on or appearance of the skin of the anal opening caused by the anal sphincter which is a ring of muscles at the opening that keeps the anus closed as stool collects in the rectum.
Hey, don't forget to clean your balloon knot.
by mistergee August 24, 2006
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a very visual description of a cat's asshole.
"your cat can sit on my lap, but he better have a clean balloon knot"
by L-sos November 13, 2007
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Vigilanty justice group taking back America one day at a time.
Balloon Knot Securtiy swept in a cured the ills of society. If not for Balloon Knot Secruity we would have lost the nation.

Balloon Knot Security, BKS.

by Disciple of Knot August 26, 2006
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Brown Balloon Knot is a phrase used to describe the look of the anus.
Next time you have hold of a blown up balloon, take a look at the ring above where the knot is formed. It looks like an arse hole. The brownness obviously comes from the colour of shit.
I finally stuck it in my girlfriend's brown balloon knot last night.
by Stainos September 04, 2006
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A puckered asshole or anus. Given the name due to the similar look of said asshole/anus to a balloon's knot covered in rust.
Dude 1: Did you ever fuck that one bitch?
Dude 2: Nah bro, I was only able to tongue punch her rusty balloon knot.
by Helvetesturm October 21, 2013
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