"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 8, 2010
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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 18, 2005
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Gamer,Defense,Initiative The GDI is a group of virgins to put it bluntly that are centralized on TikTok and Discord who are hell-bent on ruling the world and exterminating all Furrys cosplayers and vampires yet won’t get off the couch and the most active thing they do all day is make some pretty cringe videos on TickTock The leader of this group is a Black man by the name of oatmeals who goes by the supreme leader other notable figures include comrade_vasily,frobro_16 and the mafia boss
Bro why is that furry bleeding so much

o the GDI kicked his teeth in
by Black wolf 33492 December 2, 2019
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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 15, 2014
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shortened form of "Goddamnit"
"gdi, someone put shit in my pants"
by Metaka February 2, 2003
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Acronym for “God Damn Independent” meaning somebody who was smart to not follow the crowd and join a Greek Life organization. They are saved from hazing and spending hundreds of dollars but could be viewed as outsiders by some fraternities and sororities. This person played it safe and more people should be like this. This can also be used instead of saying you are not in an organization.
Person A: I decided to not go Greek and be a GDI
Person B: You are smart
by FamilyGuyfan889 July 6, 2019
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