Poosterbation or, to poosterbate, is to perform the act of masturbation while using shit as lubricant. It is most commonly performed when a person wants to bust a nut, and needs to lay a cable at the same time. A variation of poosterbation would be to use shit other than your own, this form of poosterbation is very adventurous and usually requires a level of poosterbation experience to maintain a boner as other peoples shit always smells worse than your own.
There is a high risk of infection associated with performing poosterbation with strangers shit, because you can never be sure as to what bacteria or diseases might be lurking in their poo. The most common form of infection from poosterbation is Broccoli Cock (see 'Broccoli Cock'). AIDS is a low risk due to the rancid smell of AIDS infected poo, and the high availability of AIDS rags (see 'AIDS rag') from public hospitals.
A guy and girl leave the club and sneak into the back alley together,
Guy-"I've gotta fuck you real quick cause my girlfriend will be wondering where I am".
Girl-"Have you got a condom?, cause I have AIDS"
Guy-"FUCK, no I don't, but I have an AIDS rag, quick just do a shit and wipe the poo with this AIDS rag, then I'll just poosterbate into your mouth".
Girl-"OK, I love poosterbation".
Guy-"No shit bitch, everyone loves poosterbation".