Its a short term for Yea Fool, that has other variations, but this is the most common
person 1: wtf ur crazy
person 2: yafl
by Stealthgyro January 08, 2005
Y.A.F.L. - Yet Another Fewkin' Login - a phrase describing irritation at having to create another login for some online service, such as a forum or corporate website.
Grrr.. I need YAFL to access your New York Times article.
by meukbak February 02, 2010

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