emo

1. Someone who is overly-emotional, usually in a negative way
2. Chronically and outwardly depressed

Someone can be called emo if they have at least two of the following qualities: always dress partially or fully in black (because it "reflects the color of their soul"); wear very tight and restricting clothes (constantly in contact with the skin, because they are usually deprived of any physical contact with other people such as hugs); seem to talk mostly about how sad, unfair, or hopeless their life is; cut their own wrists; or attempt to express their emotions through excessive amounts of boring dark art or poetry (also includes music).

Emo kid: "Linkin Park and Three Days Grace are my favorite bands I feel like theyre the only ones who get my life"
Normal kid: "Dude, they are Emo incarnate. You need to get laid..."