The almost magic-like phenomenon when someone who needs to take a really bad poop gets within 20 feet of a toilet and immediately they have an almost uncontrollable urge to crap.
Dude I was flexing like Mr. Universe on that road trip and when I got into McDonalds my radar sphincter went off and my turds were coming out like people in a burning building.
by T Macalicious November 24, 2010
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A tight ass.
a) resulting from being in a tense or pressured situation
b) being uptight or generally harsh
Mike is totally sphincter tight about his job review.

Dude, my dad is being completely sphincter tight about letting me use the good car Saturday night.
by todh November 6, 2007
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Someone who likes getting pounded in the butt.
She was on her period, so she just asked me to do her in the butt; that fucking sphincter slut.

by Sven, Miles, Scott, Paul July 10, 2006
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When ones sphinster muscle has been clenched for an extended period of time causing the sphincter muscle to contract and relax rapidly thus resulting in loss of clenching ability where by feces is released through the anus.
While Greg was boating in the middle of Lake Arthur he had to poop, he clenched for so long that he finally succumbed to sphincter fatigue and shit his shorts!
by butch8069 August 30, 2011
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adj: a polite way of saying asshole
well hi there sphincter boy
by Owen July 1, 2003
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having one's head up their ass
That moron has his head so far up his ass he's wearing a sphincter necklace!
by ajjrcj August 29, 2010
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The Sphincter Scale is simply a scale which measures the forces and effects caused when one passes wind (FARTS).

The scale is divided into 10 categories... with 1 being the lowest, and 10 being the highest.

1: Slight perp... sometimes silent. Usually detected within 30 seconds by a well trained nose. Best released by lifting one half of the arse and slowly allowing gas discharge. Usually has the smell of a warm biscuit.

2: Gas Shot... Can be heard if not carefully released, detection time is same as above. Very little Vibration if arse is firmly planted on chair / bench / sofa. Usually let off in queues, usually in Banks or where people are buying a Lottery ticket.

3: Flustered Fart... Can be heard in quieter surroundings, usually let off when walking. Never detected by its owner, but by the next poor soul who stops nearby the release site. Best dropped when walking away from a cash machine.

4: Parppp... Definitely detectable by anyone in close proximity. Higher volume output than that of the afforementioned scale factors... Can be used to show off to mates, or to be kicked out of bed by the missus. Slight vibration occurs if directly aimed onto a spring based matress.

5: Trump... Most commonly heard in working mens clubs, and changing rooms. Men find a sense in pride in dropping these, although women (other than wives married over 5 years) find this type of fart impossible to acheive in the presence of any person. Vibration can be felt on laminated flooring upto 2 metres from the epicentre.

6: Barp!... Highly flammable and detectable by all within a 5 metre radius. Requires round neck jumper to be substituted for gas mask for at least 120 seconds after the release. High level of Turdulence which can be easily felt if sharing a pub bench with the offending Barp!'er.

7: Serial Barp!... Not advised unless alone, or with person you dislike. A series of loud farts are released with no shame involved. Can lead to a spurt of bum gravy from the offenders rectum if not carefully released. Tremors from a serial barp can be felt many metres away. If dropped whilst bathing, can create high numbers of methanic bubbles and extremely obvious vibrations detectable by anyone situated in the room directly below the bathroom.

8: Bottoms Up... A fart of unprecented excellence, high in stink factor and low in shame factor. Only achievable by overweight men and lesbians. Requires offender to take a shite minutes afterwards, as the forces required to create a bottoms up fart can push faeces towards the anal opening and out into the offenders underpants. Skid marks inevitable.

9: Anal Lacerator... Highly potent, the force involved in releasing a fart of this magnitude are immense. Offenders are advised to use caution, examples could be by pulling down their clothing to avoid causing permanent material damage to their garments or wearing someone elses underwear. Painfully released and extremely high decibel count (over 80dB) and best dropped during football matches or when in a jacuzzi, although lifting of the arse is advised to avoid excessive vibration to the tile work.

10: The Ultimate in Fart Technology... This fart is only available to those who eat Mexican & Indian Cuisine. The gaseous effects of which can contaminate a room for upto 30minutes from the time of release. Causes eyes to water and throats to dry up. Offenders require dark underwear to cover up excessive stains. Vibrations of a fart of this power can cause tables and chairs to shake momentarily. Not advised during family barbecues and wedding ceremonies. Offending persons usually have homosexual tendencies or large thick stools which tend to be unflushable.
Guy 1: Mate I dropped a corker last night on our lasses face when she wa asleep. Set her alarm to go off straight after aswell. Must've measured a 8 on the Sphincter Scale!

Guy 2: Mint lad... did she say owt?

Guy 1: No mate, shes not moved since.
by DeV1Se October 17, 2006
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