Post Taco Bell Fall Out. PTBF is the fall out that occurs after eating an item from the taco bell menu. Symptoms of PTBF include upset stomach, diarrhea, and awkward gas. Eating Taco Bell almost always leads to some form of PTBF, except in the most rugged eaters. Often, it is worth experiencing the post consumption discomfort, because Crunch Wrap Supremes are just so damn good.
Friend (Finishes Burrito)- "Oh god I have to take a crap!"

Me- "Dude I told you you would get P.T.B.F"

Friend-"Yea but its so damn good though"
by mdw1715 November 01, 2010

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