A general term for someone who acts like they're full of shit half the time and tell the truth the other half of the time. A person who tells the truth to one person and then lies to another.
Guy 1: Man, Charlie has been a Butt Panda lately.
Guy 2: I know right, he told me he was going to be here all night.
Guy 1: That's what I mean he told me the same and then that Butt panda left about an hour ago!