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The measure of how intense your poop is after eating Mexican food. Based on the Fujita Scale (F-Scale) used to measure a tornado's intensity.

F0: Unaffected
F1: Little worse than usual
F2: Burns a little, not too bad
F3: Intense burning, but only one round
F4: Intense burning with multiple battles with the toilet
F5: Insane burning, seems like it will never end, nowhere near solid, soaks through the toilet paper, has you screaming and wishing the toilet had handlebars and cool air jets
I won't be able to make the party to tonight because we got Mexican food for lunch, I'm at an F5 on the fajita scale and won't be leaving home any time soon.
by ajm26 October 04, 2013
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