boot shat Share definition Flag when you are wearing shorts and you catch a bad case of diarrhea and the soft, liquidy shit runs down your leg and into your boot. common on camping trips or strenuous excercise. hiker 1: hey what took you so long? hiker 2: sorry i got a bad case of boot shat. boot shat by vigz June 27, 2005 0 0 Get merch Get the boot shat mug. Buy Now — $32.95 See more merch