Essentially indicates that there is nothing for which Greek people cannot come up with a particular label.
Fabulous at being apparently unable to handle ambiguity or individuality of any variety, the term GDI is a universal label applied to all college students who choose not to participate in the Greek system.
Whether the apparent obsession with labeling everything belies rampant intellectual laziness (given that it's easier to casually label things with a broad brush than to learn about them as individuals), extreme insecurity expressed in a fear of what is "different" from a certain perspective, or both is an open question.
Either way, the same mentality extends beyond the categorization of the college social structure to brand names (are you a Chanel girl? an Abercrombie man? an Alpha-Delta-Zeta or a Kappa-Gamma-Blamma?), and beyond that to even more insidious forms of labeling, such as racism.
However, it all likely comes down to extreme insecurity being expressed in one particular way; label everything, achieve nothing, derive self-esteem instead from trying to look down upon anyone whom you define as an A instead of an B.
I mean, what Sorority are you in?
None, I'm a human, an individual one even
No you're a GDI
Seems to be used in a derogatory way the most by people affiliated with the 'Greek' system because they do not realize that 'independent' really isn't even an insult. Typical brainless, follow-the-crowd, frat people. Damn, frats and sororities are like cults. People go in fine and come out brainwashed, dumb, and/or slutty. IF they ever come out.
Vic: You know, what frat are you in?
Sam: Oh, I'm a GDI.
Vic: Wow, I really think you should go Greek.
Sam: You know, they're not even really Greek. They just jacked the Greek letters and twisted them to use in their half-assed, drunk-partying organizations. I only rushed for the free food. You'd have to pay me to join one.
Vic: Why don't you join?
Sam: Um, it costs money I can't afford to waste, I can make friends on my own time, I don't really want to be saddled with people I don't like, I don't like to do pointless shit, and I don't like how they always call each other 'big' and 'little.' It's hella annoying. Oh, and I don't really like to conform.
Vic: What's 'conform?'
Oh im not, im a GDI.