1. Someone who cares more about other people than themselves.
2. Having little or no concern for oneself.
3. Devoted to others.
"She's so selfless, I can't believe she gave her 50$ to a hobo."
"Christy is helping her abusive boyfriend get his life back and she doesn't even love him anymore. Why is she being so selfless?"
Emo is just a word. It loosely describes a group of people that are inspired by music, have an alternative dress sense but cannot be called Goths or Punks. Emo is a new sub-culture of fashion and being that draws influence from predecessors' best bits whilst retaining its individuality. Usually it's only parents that mistake an 'Emu' for a Goth.
Emos are similar to punks in that they are not apologetic about dressing differently, although you're probably less likely to get headbutted for offending one. One aspect of Emo culture is the friendships between them and the way they appreciate one other. Whilst some peer groups condemn someone for daring to change or look different. Emo can be casual but bright; with contrasting colours and prints like a Nu-Punk Contrast, or can be darker, smarter and more sophisticated but with an elaborate edge.
The people involved in it didn't wake up one morning and think 'I want to be an Emo'. Emo isn't any particular fashion trend; it can be everything and nothing - its an attitude.
Taking risks isn't without its risks though, obviously, Emos are marked as targets of abuse for being different. Some people have to stereo-type things to understand them, others want to bring it down to its base level and others want to destroy what is different.
Stereotypical Emo - A person who wears skinny jeans, different shirts, and usually have black hair that is swept-ed across the face, or hair that covers or hovers over one of the eye.