A chain of mega-stores that sell everything even remotely related to guitars, putting out of business those guitar shops that sell real instruments and good equipment where they know your name and let local bands practice in the back room. Inhabited by people who think that by hanging out there or announcing that they will be visiting one of these establishments will make them suddenly popular. Full of overpriced, low-quality instruments and accessories.
Person who calls them self a guitarist even though they've only been playing for three weeks and knows one chord: I'm going to Guitar Center.
Ignorant wannabe: Oh, a guitarist! How immensely cool.