A general-use, meaningless insult used by a kid who is a colossal tool and obsessed with hentai. Though he claims it means something, I am pretty certain it doesn't outside of some hentai movie or Irondequoit High School.
Stefan: Oh, I got a date.
Me: With who? Sailor Moon?
Stefan: Oh, shut up! Potator!
Me: What the fuck does that mean?
get your grimey hands off my tequila you damn potator!