Clown's belt
a sphincter that is lacking in elasticity
"don't go there mate, my pal kicked her back door in a couple of weeks back and he reckons she's got a backnose like a clown's belt!"
"that fuckin' stinks,and it didn't even make a sound bruv, you must have a clown's belt!"
"that fuckin' stinks,and it didn't even make a sound bruv, you must have a clown's belt!"