The turning of the nose aka "Magic Cat" of the plane so as to do a full foward roll but not to spin around and look stupid like in a Aileron Roll and not to crash into physics laws like in a Air Cartwheel
Bob:Hey did you see me to a BARREL ROLL!!!!"
Sam:No that was a bad Aileron Roll"
Bob:But the Magic Cat of the plane was INSANE"
Sam:Still a Aileron Roll "