Short for Indepedence Day, the Fourth of July.
"Happy Indie Day! Don't blow any fingers off with those firecrackers!"

"Happy Indie Day! Is there any beer left?"

"Happy Indie Day! Look, I'm wearing red white and... shit these pants are brown!"

"Happy Indie day. No, not indie rock. No, not Indiana Jones either. No, not indie films... fuck it... Happy 4th of July!"
by PDXJohnny99 July 10, 2013
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