Grungie is , to put it simply , a cross between a punk-rocker and a hippy. They listen to grunge music, like nirvana and the like.

Grunge began, in the mid 80s, with Seattle indie rock and punk like mudhoney and the Melvins, and their thoughts on life and politics becoming “popular” in the underground punk world. Nirvana brought grunge music to the forefront, and the style became popular.

As for the style its self, it was spawned by combining the styles of hippies, punks, and the mere niceties of Seattle life. The long hair and naturalist theories of hippies, and the ripped jeans and “anarchist” liberal views of punks , and the fact that Seattle is really cold made them were Flannel , creating the "grunge look".