Definition of emo noun from the Oxford Advanced Learner's Dictionary
emo
noun
ˈiːməʊ ˈiːmoʊ
pluralemos
1[uncountable]a style of rock music that developed from punk, but has more complicated musical arrangements and deals with more emotional subjects2[countable]a person who likes emo music and often follows emo fashion, wearing tight jeans and having long black hair. Emos are typically supposed to be emotional and sensitive and full of angst.