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1. A bone in your butt

2. A term of derision, usually applied to small boys ages 9-11 who are foolish and immature. Such boys are often skinny distance runners. They will usually attach to older roll models, often cousins, and refuse to stop annoying them despite countless hints, suggestions and outright commands to stop.

also they are often named Koby
sphinct by zachattax August 15, 2010
Ouch! It's really burning my sphinct
sphinct by Wu Dark March 30, 2004
(verb) to have anal sex with a girl.
Bob: "Dude, did you sphinct her?"
Joe: "Did I what?"
Bob: "Sphinct her. You know, did you have anal sex with her?"
Joe: "Yeah. And ohhh, I get it now; sphinct her, like sphincter... nice."
sphinct by josh_SLC January 27, 2010

sphinct-ear 

The way your ear piercing can look like a butt hole if you gauge it too big too quickly.
My buddy Trevor got sphinct-ear when he tore his ear lobe by skipping from 4 gauge to double zero gauge.
sphinct-ear by ruthless toothless August 30, 2013

sphinct-o-second

That split second just as you realise something really bad has/is about to happen, your stomach feels like you're falling off the top of a tall building and your sphincter grips up tighter than a Duck's Arse.
1. I was in the office late at night and thought the place was empty, I was just about to start Rounding up the tadpoles when a cleaner walked in! There was a sphinct-o-second moment while I frantically packed my todger away.

2. Sent a sext message saying "I'll be home in 5, lube yourself up!" and as I hit sent, I saw "Received: mother in law" !
sphinct-o-second by ADzski March 7, 2019

Sphincter Sinatra 

one that loves to break wind and will do so anytime or anywhere (like a crooner that breaks into song in an old 40’s musical)
“Dude, plug that blow hole. Nobody wants to wants to hear your ‘Summer Wind’. Don’t be a sphincter Sinatra.”