nasty oyster

Further advanced sexual technique where the male in either a hetro or homosexual pairing, piss fucks the recipient up the ass, throws up into his hand and then rubs the sick into the recipients face.

It gives the experience of a night out at bad seafood restaurant without having to spend any money.

Dave: "Shall we go to the new seafood restaurant on the shore?"

Matt:"Nah, we can just cut to the chase with a quick Nasty Oyster"