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
Get the balloon knot mug.
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 14, 2007
Get the Balloon Knot mug.
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 27, 2006
Get the Balloon Knot Security mug.
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 22, 2013
Get the rusty balloon knot mug.
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 4, 2006
Get the brown balloon knot mug.