Emo Is A New Type of Word

Here is the Emo What? motto:

"Emo. A type of music? An adjective? A noun? A social group? Here's where we get into the history of emo, what is "emo". Emo is not necessarily an insult, nor is emo music always bad. So why is the word "emo" the new "loser"?"

we know emo is a type of music, and that now people are being called "emos" in the form of "you're an emo". So linguistically, what does this make the word emo? Originally it could be thought of as more of a genre of music and simply left at that, but with the evolution of the term it has grown to explore many new facets.

1. Emo is used as an adjective (describes a noun), as in "emo hair"
2. Emo is used as a noun (a person, place, thing even if you can or can't touch it), such as "you're an emo"
3. Emo could be used as a adverb (describes a verb), as in "he did an emo dance"
   
4. Emo is definitely a type of music

So what does this mean linguistically? Not many things in the English language can be classified as more than one type of word, really up until now every word has. So is this a new type of word? Has 'emo' just made world history, becoming the first multipurpose word? I mean, you can't use good as a noun, car as an adverb, or swiftly as a genre, so why is it you can with emo?

Have any more uses for emo? Comment.