Is a title given to someone who holds an exalted position.
The name has come to be used as a mocking title for someone important or high-ranking and who exhibits an inflated self-regard.
"Fred Flintstone and his friend Barney Rubble were members of the Loyal Order of Water Buffaloes Lodge No. 26. A high ranking elected position within this organization is Grand Poobah or Grand Imperial Poobah. Poobah is a title of respect and often is linked to might in a role."
There's Larry again, trying to tell everyone what to do and swanning around like he's the Grand Poo Bah.