When someone acts foolish or stupid to distract from their true goals or needs. this stems from the popular theory Jar Jar Binks acted to accomplish his own goals as a Sith Lord, while using the mask of a fool to fool the Jedi.
Guy : don’t trust that dude.
Gal : Why not, he seems kinda fun in a dumb way.
Guy : he’s using the Sith Jar Jar Principle (Sith JJ Principle) to rope you in, I wouldn’t trust him too much.