The act of shitting(defecating) in the shower. Often accomplished by the user sitting on the shower drain and doing his act through the little filter that picks up the hair.
When the plumber came, the marks around the showerdrain made it obvious that Michael Z had been showeting under the supervision of Mr.S.
The act of shitting and vomitting simultaniously after a long night of drinking, possibly mixed with perscription drugs.
After Paul's blackout birthday party at the thirsty turtle, Jay came back to the dorm and was shomitting after drinking way too much mixed with muscle relaxants. This resulted in a trip to the hospital, and a night where no one can forget the little bit of what they remembered.