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
GDI
God Damn Individual. Used in the U.S. Army to denote someone who refuses to take orders and does whatever the fuck they want to the chagrin of their unit. Especially used in Basic Combat Training (BCT) where Drill Instructors attempt to turn a shit-ton of diverse recruits from different backgrounds (GDIs) into one cohesive functioning military unit. But there's always the one fucktard who doesn't give a fuck and will do whatever they want and will always be a GDI.
"Yo G, that fucktard doesn't give a fuck. He just made our whole platoon do 200 pushups by being a retarded fuckup. What a GDI. Let's throw him a blanket party tonight."
by 7upp December 30, 2009
GDI
Shorthand version of the Global Defense Initiative, one of two factions in the Command & Conquer series of games.(Generally regarded as "the good guys".)
The GDI has Mammoth Tanks, while Nod has Stealth Tanks.
by Joseph D. Collins May 01, 2005
GDI
A Person who wears colorful clothing that is not a pastel and flat brimmed hats to match
A Person who cannot distinguish between, Frat and GDI
by Collegiate Social Information February 21, 2012
GDI
Acronym for "Gays Day In."
Danny: "Let's have a GDI and watch Sex and the City."
by DJ Andre October 15, 2009
Gdi
Non-greek, non-person that can be spotted rocking WWE teeshirts, gel-crusted hair, cargo shorts, tennis shoes, longboards, and snapbacks. Is an initialism for god damn independent but should never be capitalized because they are not worth holding the shift key for. Can often be heard bashing the greek system after embarrassingly being denied entry into a house party on multiple occasions for which it was not given the address but followed the tracker on its girlfriend's phone. On the rare occasion that a gdi is allowed entry, it will almost certainly die of alcohol poisoning and give the chapter a bad name.
Today a gdi asked me why I'd want to pay for my friends. I told him he couldn't afford to understand. TFM
by ReaganTFM November 14, 2014
GDI
"Good day indicator" - A gauge to help one measure how good the day will be. Normally to achieve a good GDI you must have sex upon waking up. First thing. Not after breakfast or showering or brushing teeth. Right at the awakening. To have a high GDI, orgasm has to occur, no if, ands, or maybes.

For a male: high GDI occurs when fully incapacitated after morning sex.

For a female: uncontrolled squirting or jello like legs with the inability to stand. Or the mixture of all the above.
I feel great today! This morning my girl/guy raised my GDI so I feel like I can take on anything!

What's your GDI at?
by calie2bama June 08, 2010
GDI
God Damn Inbred.
Isaiah is such a GDI.
by zlampiece January 04, 2011
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