Chapi Chapo...

Chapeau, pronounced Sha-poh, is French for "hat"... Chapi/Chapo, like that song is saying, basically translates to hat boy and hat girl... I imagine it's something similiar to us having big comfy couch.. just some random object that they used for a character..

And the chances of anyone remembering it are slim to none, unless someone here grew up in France in the 70s.