A horse usually blond, easy to hurt and VERY shaggy, who finds himself in real world scenarios such as a classroom, or an office building. The street horse is a timid creature, it is very rare to see a street horse fully tamed. They respond best when you offer them cheap goods, such as cheap headphones or food such as Campbells chunky soup. If you see a street horse, the best course of action would be to call your building administrator and have them dispose of it.
"Holy shit dude! A fucking street horse, where did that fucker come from?"
Street horse: "Neeiiiigghhh"