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1.
Various irritants that descend upon humans and plague them during the fall season. A combination of "fall" and "allergies."
I'm expecting the worst when the 1st round of fallergies hits me.
by Kamikaze Kool-Aid Man October 04, 2010
 
2.
a fake allergy
dude, he just doesn't like her. he's not allergic to strawberry lip gloss, it's a fallergy
by Bokoroco June 11, 2011