GDI

Frat boy acronym for "God Damned Independent", i.e. any college student who isn't in a fraternity or sorority.

"I don't want to belong to any club that will accept me as a member." - Groucho Marx

Gross Domestic Income. Always equal to the Gross Domestic Product {GDI), and for this reason:

The GDI is the measure of money gained by the government, corporations, and people, while the GDP is the measure of money spent by said individuals. Since money must be spent in order for it to be gained, GDP and GDI are always at a constant state of equilibrium.