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.
by mistergee September 14, 2008

by omegaman December 10, 2008

by L-sos December 9, 2007

A dirty butthole or asshole.
by Monica Four Twenty April 24, 2019

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.
Balloon Knot Security, BKS.
by Disciple of Knot September 16, 2008

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.
Dude 2: Nah bro, I was only able to tongue punch her rusty balloon knot.
by Helvetesturm October 21, 2013

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.
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.
by Stainos September 4, 2006
