An expression used in a moment of fascination, surprise, happiness, excitement, hype and agreement. Basically used to express whatever one is feeling at the moment.
It is a vibe.
Some may call it a movement.
It can also be used as call and response for greetings, motivation/ginger.
"Did you see that killer move? Shadayo Shabada!"
"Call: Shadayo!?
Response: Shabada!"
"Person 1: I got a promotion.
Person 2: Shadayo Shabada!"