Noun
(idiomatic, colloquial, often humorous) A person who is important or high-ranking.
He once played golf with the grand poobah of their company.
An extremely pompous person.
Grand Poobah (plural Grand Poobahs)
Alternative letter-case form of grand poobah
Is it any surprise that the Grand Poobah of sappy love songs makes an appearance on this list? Source: Internet