The douche of all douches. He is The Supreme Douche. All other douches, even The King of All Douches, are subservient to him, for his douchiness is beyond all others.
Dude! Look at Dick! He's being such a douche he can only be The Supreme Douche. No one could be more douchy than Dick. He's clearly der douche meister.
A person in a position of power that is both incompitent and a total asshole. He/She blames you for there mistakes, but there is nothing you can do about it because they're your boss.
My boss is such a frigin douchemeister! He made me come in on my day off so he could go golfing!
Mr. Skinner is a goddamn douchemeister! He gave me an F because he lost my exam!