Where did the term goth originally come from?

Around the fifth century, the Goths were a tribe that helped defeat the Roman Empire; by the 1500s,gothic meant "barbaric" and was used to insult a new style of architecture; that architecture became associated with the medieval age; ideas of medieval darkness and mystery inspired gothic fiction of the 1800s like Dracula.

All this eventually led, in the 1990s, to goth fashion - characterized by vampire-ish black clothes and eyeliner, and a preference for dark music and moody Romanticism.

(from merriam Webster online dictionary, top ten Words from the 1990's)