a fun way of saying 'spleen' which is a large dark-red oval organ on the left side of the body. Must be said in a high pitched squeeky voice for full effect.
The act or instance of having a mass of soft tissue, usually the spleen, ripped or torn from the body, often while the person is still alive and shrieking and thrashing about horribly.
Jason got spleened yesterday at the plant when he got too close to some dangerous machinery. Took hours for the surgeons to fix him back up.