Stan

Slang derived from the song aptly titled "Stan" from the Marshall Mathers LP, in which an obsessive fan named Stan goes as far as to kill himself in order to be recognised by his idol, in this case, Marshall Mathers. Stan is generally considered to be a portmanteau of "(st)alker" and "f(an)".

In recent times, the definition has just been changed to "someone who supports a creator a large amount", but many feel that doesn't do the term "stan" justice.

Person A: "Wait, if we are to go by the old definition of stan, are all the Twitter stans I see regularly really stans?"
Person B: "It's internet lingo, get over yourself."