A state of being. When a person who is usually intelligent, happy, and personable, is so sad that they are acting "emo". Could be described by simply calling them "emo" but this allows a noun to be used.
"I was feeling great, but then I was stricken by a wave of emotasticosity, so I sat there in the middle of the mosh pit thinking about how terrible my life is.
by The Magician August 12, 2006