okay, let me clear this up, a lesson on emo...
THE NAME 'EMO'- short for emotional. which is pretty ridiculous in itself. emo kids are very emotional, but just because someone is emotional or sad doesnt make them emo. you'll also find that most of the emotions that emo kids convey are actually superficial and hollow.
THE MUSIC- this is where emo originated, in music. the content of emo music is all about the hopelessness of life, and tries to be introspective, but more often than not its superficial and hollow immature adolescent rantings. emotions are taken to extremes. these themes are consistant in all emo bands, and basically the subject of every emo song. though, just because a band performs a song with similar content doesnt make the band or song emo (since this content can be found in music from every band in the history of music). the band would only be considered emo if this is found in the vast majority of their music and the song can only be emo if its coming from an emo band. emo is often credited to being brought into the mainstream by the band dashboard confessional.
THE ATTITUDE- like everything else to do with emo, the attitude is hollow and superficial, though emo kids believe it to be real. they are often distraught and depressed over trivial bulls#!t things that everyone deals with, they merely take it to the extreme, in an attempt to appear unique, introspective, and sensitive. they literally perpetuate their own sadness, they wallow in it, then they complain about being sad. they strive to seclude themselves from others, then complain about being secluded. they'll often say things like they hate their lives, no one understands them, and come off as suicidal. they're actually far from being suicidal, they just say that for the attention. though, some will go to the extreme to cut themselves to appear they tried to commit suicide (Again for the attention), they'll also say they cut themselves because thats the only way they can feel anything anymore. emo kids usually put up a front of perpetual sadness and depression, and will flaunt the fact that they're on medication.
THE FASHION- long hair, flat ironed down to cover half of their face, dyed black (perhaps with bleached highlights), mail carrier style bag, converse, tight pants, tight shirts, neo-retro, thick black glasses, cuffed pants, argyle socks, etc....though, seeing people with a combination of these things doesnt make them emo. though, if you see someone with the majority of these things, then theres a good chance they are emo.