pooh-bah /ˈpuː bɑː/ BrE AmE noun [countable] informal
[ Date: 1800-1900 ; Origin: Pooh-Bah , character with the title "Lord-High-Everything-Else" in the operetta The Mikado by W.S.Gilbert and Arthur Sullivan ]
someone who is important or powerful – used to show that you do not respect them very much:
the pooh-bahs of the technology industry