A genre of modern 'rock' music. Bands such as Bloc Party, The Killers and Keane are good examples. The name comes from the fan base who are primarily middle-class students who wear scarves and converse shoes and listen to that crap on their ipods.
watch MTV2 (UK) for examples.
Oh dear....not another one of those scarf metal losers on MTV2.
You look like a scarf-metaller in that scarf and those shoes.