("mwai") A sound used when deep in thought to pass the time audibly while you try to come to an answer.
It is derived from Shakespeare's Twelfth Night, in which the character Malvolio sits pondering the letters "M.O.A.I.," trying to decide if they refer to his own name.
instance in which a person acts extremely emo, whining about how awful their life is, how no one understands what they have to go through, etcetera, etcetera, and generally is just an extreme nuisance by refusing to hear reason
Don't even bother trying to talk to her right now... She's having an emofest.