This is when a man (or sometimes woman) is bent over giving the man a blow job. While this is occurring the man/woman giving the blowjob is shitting. Simultaneously, the man receiving the blow job vomits down into the man/woman's ass crack causing a flood of vomit and shit to be flung from the anus.
*Someone who i well verse in being the bent over participant can suck vomit into the anus and then spray it out in a plethora of directions.
Ex. a man recieveing a bj vomits into the ass of the man or woman who is giving it while he or she shits, making her a Rumpelstiltskin