Ass plasma is when you have explosive diarrhea and fart at the same time.
Ass plasma adds to the ass states of matter:
Solid - normal poo.
Liquid - Ass Liquid .
Gas - Farts.
Plasma - Ass plasma.
Dave: Are you still sick?
Eric: Yup, im constantly having ass plasma. Yuck! Well, its worse for my mother having to clean it up...