Stan is a slang term used to described anyone that is overly obsess with a celebrity figure. The term was coined after Eminem's song titled "Stan" was released. The Stan song by Eminem described a fan whom was overly obsess with Eminem, he kept writing him letters until he finally committed suicide due to Eminem's lack of response to his letters. Stan is believed to have been created from the word "Stalker" and "Fan".
Nowadays anyone whom come to the defense of a of a celebrity being fairly criticized just because they are a fan is usually called a Stan. While some celebrities fear having Stans, some are well appricative of their dedication such as Jessie J whom said ""They're amazing, and they're the only reason I'm here at the VMAs and people know who I am."