Also known as a dorm rat. A student that for whatever reason, wants no part of the greek system. They oftentimes sit alone in their dorms on weekends wondering whats going on in the outside world. They have a distinct unfounded hostility toward Greeks, but never hesitate to leach off of them, such as drinking their beer, or attending parties, from which they always end up going home alone. Many of them get all of their information on Greek life from TV and movies, they never bother to do any actual research. According to them, Greeks are "losers who have to pay for their friends." It never occured to them that one of their favorite celebrities is very likely a greek. It never occured to them that a "frat boy" could someday turn out to be, say, some of the greatest athletes/coaches of all time(Michael Jordan, Shaq, Karl Malone, Wilt Chamberlain, Orel Hershiser, Terry Bradshaw, John Elway, Jerry Rice, Emmit Smith, Jackie Robinson, Hank Aaron, Pat Riley, Phil Jackson, Larry Brown, Mike Ditka, Tiger Woods, Jesse Owen, Troy Aikman, Lou Gehrig, just to name a few), some of the most famous actors/entertainers(Elvis Presley, Johnny Carson, David Letterman, James Caan, Burt Reynolds, Bob Hope, Brad Pitt, Matt Groening, Steven Spielberg, Warren Beaty, Tom Selleck, Ron Jeremy, Paul Newman, Merv Griffin, Danny Thomas, James Dean, Harrison Ford, John Wayne, just to name a few), (Martin Luther King Jr., Rev. Jesse Jackon, Nelson Mandela, 85% of US Supreme Court Justices, 76% of the Nations senators, all but two US presidents since 1825), a famous astronaut(everybody on the Apollo 11 crew), a famous business owner(43 of the 50 largest corporations in the nation are headed by "frat boys"), or even their mommy and daddy's boss. According to studies, only about half of GDI's end up graduating college, as opposed to 71% of Greeks.
That kid went GDI after getting blackballed by 2 fraternities.
by TKE468 January 02, 2006
can either mean god damn independent or in this case god damn-it: a way to show ones annoyance towards something or an action.
it is a negative comment
NOTE: this is for txt or typing only not to be used in speech conversations
(during a MSN chat)
bob: how did u do on the test
max:GDI it was terrible
by adam warner May 03, 2008
Someone who's highlight of life thus far was the dvd release of finding nemo. Seen rarely in its natural habitat as few dare to venture into its sausage-fest dorm hole. Never known to slay box, or consume frat-water. Spends weekends playing halo and consuming mass quantities of hot-pockets and mountain dew. Known to study and NEVER party.
Be extremly cautious around this species as inherently fratty gentleman have been known to cause head-explosions.
Common test prep of a GDI:
Frat - Locate test bank
GDI - Locate all optional and supplemental readings

Frat - Invite sorostitute to frat castle for intense study session of French wine & human anatomy
GDI - Skip playing Halo 3 and begin memorizing all the chapters of the textbook

Frat - Have pledges recite old exams from the test bank while you spit skoal at them & watch Wednesday Night Baseball. Then, hit the bars.
GDI - Have Halo 3 GDI buddies review your flash cards with you. Then, hit the bottom bunk of your dorm room

Frat - Thanks to the test bank & the hot sorostitute to your right, finish the exam in under 30 minutes. Shoot a mini while walking out of the classroom.
GDI - Have nervous breakdown after none of optional material is tested, and fail to complete exam. Soil cargo shorts while walking out of the classroom.

Frat - Purposely kill brain cells
GDI - Locate all optional and supplemental readings for next exam

Frat - A . . . job is lined up for you after graduation.
GDI - C . . . what life is like bagging my groceries.
by FrattingHard April 23, 2009
1. God did it!
2. God damn it!
3. God Damn Independent
Religious people who can't explain scientific stuff say "God did it!". GDI is used to make fun of those bigots.
by -theo- November 27, 2007
Someone who doesn't join a fraternity for some reason. Maybe they're a douchebag who shouldn't join in the first place, or maybe they're balled for some reason. Regardless, they are not fraternity material.
"I don't wanna join a frat because they are gay," said one GDI. "Well, I guess you wouldn't fit in to my fraternity anyway. We don't refer to our brotherhood as a frat. Would you refer to your country as a cunt? If you would, get the fuck out of my house. If I see you again, I'll haze your ass so quick I won't even be able to 'ball your ass."
by SNFratDaddy September 22, 2007
shortened form of "Goddamnit"
"gdi, someone put shit in my pants"
by Metaka February 01, 2003
God Damn Independent
Someone who leaches off the frat system, comes to parties, drinks fraternity beer, and goes home alone. They like to think that fraternity men "pay" for friends, but they can't possibly know, they weren't good enough to get in a fraternity to begin with.
Someone kick the GDI out of here, he's drinking all the beer and scaring the women.
by WFUBaller September 19, 2005
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