Top Definition
ring-like muscle found in the anus
From the South Park song "Mr. Hankey the Christmas Poo"
and won't fall in the toilet
coz he's just clinging to your sphincter
and he wont drop off and so you
shake your ass around and try to get it to drop in the toilet
and finally it does
by The Real Izzy December 10, 2005

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noun: one's pooper
gentlemen, rest your sphincters!
by the storm drains April 18, 2009

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the muscle that makes you poo
i had to get 16 stitches in my sphincter because vitt did me up the arse
by Morroco August 18, 2003

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a muscular ring that closes a bodily opening
I had to shit the runs during the whole date with that babe last night. I kept thinking "Sphincter, don't fail me now!"
by King Shit January 19, 2003

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the circular muscle in your arse;
the poo-cutter
"aww that huge crap made my sphincter hurt"
by Bronoun September 20, 2004

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possibly the coolest word in the english language
may hurt during anal penetration
omg sphincter!!!!
watch out for the sphincter, it might be hard to shit!
by Zaquie July 26, 2006

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muscle in ur bumhole that acts like a railroad switch tie to direct the output
1.if u tickle my bumhole, i may poop, or fart
2.I was peeing and my sphincter caused me to flatulate
by kal August 09, 2004

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