Someone who is a real pain in the ass to be around the majority of the time you chill with them, but is good for a laugh here and there. Also, they aren't very attractive. Resemble a rat in some way and would be one of the first people to rat you out in fear of getting caught themselves.
Noname: "I really wish he wasn't such a bitchrat every time we hang out!"
Nunya: "True...there's no way to avoid him."