the change of someone either physically or mentally to an emo's. Usually occurs over the summer or usually when u haven't seen said person for an extend time.
Steve: Did you hear about what happened to Geoffrey?
Joe: No I didn't. What happened?
Steve: He went through a total emomorphisis over the summer!
Joe: Man, who woulda though that would have happened to the most popular guy in school.
Emomosh is when one or more emo kids start trying to dance around wildy, by throwing their arms everywhere, and also kicking and spinning rapidly. This generally looks like they are crazy, but they are acctually trying to accomplish looking like they have 1337 karate skills, or that they are very scene/emo/hardcore etc.