t-stain Share definition Flag A stain in the shape of a "T". Could also be used an an abbreviation for "shit-stain". Holy t-stain, man!There's a small t-stain on your shorts, Jesse. t-stain by Jcrew12345 August 26, 2009 0 0 Get merch Get the t-stain mug. Buy Now — $32.95 See more merch