(frat-tee)verb - Derived from common behavior by frat guys after a crazy night. The act of being wild or extreme for no apparent reason besides being wasted and/or angry. Such actions include breaking beer bottles, being a jerk, fighting, and yelling, usually resulting from the consumption of large amounts of alcohol.
"Man, you got so fratty last night! You fratted that guy out the window and shattered a 40 in the bathroom!
"Oh shit, are you serious?! I don't remember a damn thing! FRAT!"

by Travis E. November 15, 2005
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adj. used to describe a person as being a closet homesexual, while at the same time wasting their parents money on "straight" clothes they noticed on a half-naked male model at Abercrombie and Fitch (Polo and Lacoste are another two companies who market to these "closets") Also used to describe specific items of clothing that everyone around you also owns, and also got turned on by when they saw their male friend wearing their shirt "the next morning."
"Dude, we are so fratty!... But did we do it last night after our frat party? Well, it doesn't matter.. we clearly aren't gay since our shirts are so fratty."

"Yeah, but I love to see your sack hanging from that fratty shirt.. but I should hush up since we are supposed to act straight"

by freddy J July 6, 2006
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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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also called natty light. The frattiest of beer.
Pass me a fratty light.
by john_montana May 31, 2006
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A style of daytime dress popular at many US universities where members of fraternities go to great pains to appear to be homeless.

Typical attire includes boat shoes or Wallabies missing the laces, gym shorts, and a hideously stained, presumably once white t-shirt. Hair should be disheveled at best.
To dress up as Carl for halloween, his fraternity brother donned a fratty vagrant style, wearing gym shorts, an undershirt, boat shoes, and smeared Crisco in his hair. Even his girlfriend couldn't tell the difference.
by HoboCarl February 20, 2009
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A phrase used to describe something with ample amounts of raftusism. This phrase is heard commonly at frat party’s, college dorms, kick backs, and other functions.
Todd: “Bro Sebastians had like 16 stellas tonight he’s fucking blackout”
Chad: “No fucking way buddy that’s so fratty beers”
by BigBlair55 August 23, 2021
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