Shanghai

To vomit on one's own genitals while sitting on the toilet, naked, defecating.
Also can define a situation where one vomits at a wall in front of him while sitting on a toilet, naked, defecating, and it sprays back in his or her face.

"Wow John totally Shanghai-ed last night and left the bathroom in such a disgusting state that I threw up immediatly! AWESOME!"

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