When a group of 5 or more males acquire and gangbang a female corpse. After each of them has finished inside of her they draw straws or have another means of selecting a chosen one person. That person puts their mouth around the entirety of the vaginal area. The largest or heaviest individual then jumps onto the stomach of the female thus ejecting a mixture of bodily fluids, and likely maggots or other decomposing creatures into the chosen one’s mouth.
Me and some friends tried a necrophiliac mulch and I unfortunately only got to jump but it was a blast.