Cocoricocoboy is an old French TV Show. Often reffered to as an
idiot or someone who thinks they're
mad or
awesome. Mainly used on guys, because it is CocoricocoBOY. But can be used on girls also.
Person 1: That
guy reckons he's so Cocoricocoboy.
Person 2: Yeah I know, what a
bert.
Another example:
Guy 1: Look at that girl, she's
dating such a Cocoricocoboy!
Guy 2: Haha, yeah I know!