Could you provide more information? Depending how it is used, it could mean totally different things. "Call me manic" could mean that Manic is the name someone wants to be called. Alternately, if somebody recognizes they are saying something out of the ordinary, they might jokingly call attention to it by starting the sentence with "call me [something], but .... Some examples: Call me crazy, but I could swear that clown wants to kill me. Call my vain, but I'm the prettiest person here. Call me naive, but I think everybody in the world is truly good at heart. Call me manic, but I think 8 hours of sleep per night is overrated. Alternately, manic is a state of heightened energy.