A person that can appear initially to be attractive in some way, but ends up being ratchet and savagey in the way they talk, the way they treat people around them, and the way they act when they are in a relationship.
Singular: "I thought he was cool, but he turned out to be another rank Eeehi."
Plural: "Make sure you know who your friends really are under all circumstances, don't let yourself be surrounded by Eeehi's."