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1.
noun (slang); An allusion to the Richter Scale which, instead of measuring seismic activity, quantifies the magnitude of undesirable aspects. One of many colloquialisms used to define this magnitude (synonyms: suck-o-meter, dick meter, fail scale, et al).
"I give this whole thing a Sphincter Factor of about 9.5!" -- 'Hippy' (Todd Graff) in The Abyss (film, 1989, dir. James Cameron). Possible origin.
by Rancorr Blackmane August 05, 2009
 
2.
Similar to the Reichter scale, only used to measure the extent to which an object, idea, or situation is fucked up.
This new Steven Seagal movie is a Sphincter Factor Five!
by squirrelmaster5.0 June 08, 2003
 
3.
A television show similar to Fear Factor in which contestants shove bull testicles and insects up their butt-holes rather than eating them.
Dude, did you see Sphincter Factor last night? A guy totally shoved scorpion up his ass!
by an0n1989 October 18, 2009