vic: what's your title?  sam: what?  vic: you know, what frat are you in?  sam: oh, i'm a gdi
"acronym for "god damn independent," often used in a derogatory way to refer to a college student who chooses not to join any sorority or fraternity
"vic: what's your title?  sam: what?  vic: you know, what frat are you in?  sam: oh, i'm a gdi" What is the definition of "gdi"?