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.