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An expression of disinterest. Usually followed by a number -- the higher the number, the greater the lack of interest -- and, occasionally, a reference to Sulu, the helmsman of the Enterprise.

As this phrase is a reference to the original Star Trek series, it shall be generally understood that 9 represents the highest normal whoop factor. Anything higher indicates an excessive whoop factor -- and, by extension, an extreme lack of interest.
Figure skating on TV? Whoop Factor 9, Sulu!
by refriedwhiskey August 13, 2009

Words related to whoop factor

boring disinterest sulu trek yawn