One of many things people (usually high-schoolers) call themselves in order to fit in with others sharing the same "interests". Emo, punk
, all of these (and more) are words used to describe people who dress and act like others hoping to fit in.
Ryan had no friends because all he did was cry and moan about how bad his life was. Then Ryan turned on MTV
and realized if he wore makeup and dark clothes he would fit in with a bunch of pussies who call themselves 'emo'.