WTMGDI Share definition Flag Stands for Way Too Much Goddamned Information. Internet slang. Person 1: ._. So, I have bleeding hemorrhoids. I need to wear a tampon up my ass. Person 2: >_< Whoa, WTMGDI. WTMGDI by Sno Wolf December 9, 2008 0 0 Get merch Get the WTMGDI mug. Buy Now — $32.95 See more merch