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To have a toddler tantrum over something as small as a bag of chips.
I totally had A Riley last night, man. Tears and everything. I couldn't get iTunes to work...
by MrsStinson January 06, 2011
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

by Billy Chickenhole September 15, 2007
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To publicly make a fool of yourself when trying to make another look foolish. For instance, to accidentally dox yourself when trying to dox another.
Did you see that guy give out an eclipse photo file to prove there is no earthshine during a total eclipse, only to have the other people find earthshine in that photo, talk about pulling "a Riley."
by GaryMoore September 11, 2017
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