Oh boy. Here we go into a giant rabbit hole filled with either positive definitions or hate definitions. And both ways do NOT have the likes topping dislikes...
Generally, a
Slipknot fan is...well...a fan of
Slipknot. That's really all there is to say.
Slipknot also has a general name for these fans: "maggots."
Some "common" (real maggots may correct me because I personally don't care about
Slipknot) characteristics include:
1). Slipknot merch
2). huge factual knowledge about Slipknot and all side projects and other related artists
3). homemade masks that legitimately look like a Slipknot member would wear one (depends on if they're a hardcore fan or not)
4.) getting hated on which I DON'T condone, don't go out attacking anyone for their taste in music, especially if it's a genre/band you don't like at all