What does asshole is throwing up mean?

asshole is throwing up meaning in Urban Dictionary

the involuntary work of shitting which generally will leave your asshole burning. this is when you have got a case regarding the works, and you also finally make it on bathroom plus gut involuntaryly sucks in and the shit squirts out automaticly. Jus like puking but from other end. the only real huge difference is the fact that u cant use your hand to cause this sort of throwing up!