43
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
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44
"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
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45
1. Damn GDI wont even join a frat!

2. Holy crap! That fag's such a GDI. Why doesnt he SKL all over my TDR?!
by Your Mother March 17, 2005
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46
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
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47
shortened form of "Goddamnit"
"gdi, someone put shit in my pants"
by Metaka February 01, 2003
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48
Isaiah is such a GDI.
by zlampiece January 04, 2011
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49
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
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