What is the secret code of Scooby Doo sword samurai?

There's no official "secret code" for Scooby Doo Sword Samurai. The show itself is a parody of samurai movies, so the humor comes from the absurd situations and slapstick, not from secret codes.

Perhaps you're thinking of a different Scooby Doo episode or special? If you can give me more details about what you're looking for, I might be able to help!