adj: used to describe actions, events, and attire that represent the fraternity.

If you don't go to an Ivy League school, or didn't attend a New England prep school, chances are, you are not fratty. Sorry.
Brooks Brothers, Godlike Keg Stands, Thomas Pink, and Vineyard Vines are all fratty.
by F. Ratty July 19, 2006
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The act of being like a frat guy...usually entails wearing pink polo shirts with lots of hairspray and celtic barbed-wire bicep tattoos.

Can also describe anyone who partakes in date-rape or soggy biscuit viagra parties.
Guy: "Man, what's up with Randy lately? He looks like Ricky Martin and he smells like a hooker!"

Liz: "Oh, he's just going through a fratty phase, it'll pass"
by jimmy patrick February 15, 2008
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When someone is acting like a frat boy they are being fratty
when a guy is acting like a douche or fuckboy, they are acting like a frat boy... therefore they are acting fratty
by thisbitchistoooocoolforschool January 14, 2017
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