Pooh-Bah or pooh-bah (pbä)
n.
1. A pompous ostentatious official, especially one who, holding many offices, fulfills none of them.
2. A person who holds high office.

[After Pooh-Bah, Lord-High-Everything-Else, a character in The Mikado by W.S. Gilbert and Arthur Sullivan.]

Now, a Grand Poobah is something else...