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35.
GDI
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
 
29.
gdi
1. God Damn It!
2. Gosh Darn It! (In Politically Correct newspeak)
GDI, I lost again!
.
by keyshaw September 23, 2004
 
30.
GDI
The loners not associated with greek life. Have parents who work as janitors, and who will one day become the bottom dwellers of society.

Can usually be found creeping the shit out of sorostitutes at frat parties, talking about their unsuccessful WOW raid the night prior.
Hurry quick GDI Old Navy is having a sale on cargo shorts!!
by TooFratastic December 03, 2010
 
31.
GDI
One who possesses unfratty traits, also known as a Skip. Key terms include: "chill out", "yeah", "dude", and "tootle"
Hey bro you are so GDI, I mean you haven't slayed in forever. Man you are such a skip.
by Scott Michael Jackson February 24, 2008
 
32.
gdi
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
 
33.
GDI
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
 
34.
GDI
"God Damn Independent" One who is not envolved in a greek organization. Typically engages in acts of douchebaggery, and envy all those who are greek.
Gelled hair Meatbags, Hippies, Goths,wannabe surfers and Nerds are all examples of GDI's
by Sig Ma Chi April 15, 2008