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!