TGITDAT Share definition Flag Thank God It's The Day After Thursday! Instead of saying "Thank God It's Friday" (or TGIF), you could say "Thank God It's The Day After Thursday" (or TGITDAT). TGITDAT by Gotageek December 18, 2009 0 0 Get merch Get the TGITDAT mug. Buy Now — $32.95 See more merch
