When you shit in the woods while camping and you run out of toilet paper. While exercising your last shit ticket you get some shit on your hand and need to get it off by shaking and flicking vigorously.
Usually an unexpected precursor signal from your stomach to your sphincter informing your hole that you are about to release a Hendren ( A giant turd )
English slang which can mean feeling poorly or can describe something as useless or unfit for purpose. So if someone says they feel like shit warmed it means they are feeling extremely unwell or under the weather. But if it is their opinion of a device, person or product, it means that the device, person or product is a total WOFS.