Wow....so y'all use that to refer to non-greeks?! I know on my campus, they use it to refer to locals...which is why I hate the term! My brother used to call me a GDI all the time and it would piss me off so much! It made me feel as though I was less of a greek than he was just cause I was in a local and he was in a national.
I guess hearing how the term is used in the States makes it less annoying for me...but I know how everyone back home uses it....and it still annoys me!