his nibs

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Someone who gives a command or makes a demand, often one who acts in a self-important manner, sometimes one with authority; - used mockingly as a jocose term, as if a title of honor, but not usually in the presence of the person referred to, and usually indicating resentment or contempt.

See also: Nib

References in classic literature ?
Singer had given up his nibs too, but he had kept back a very large one, called a Jumbo, which was almost unconquerable, and he could not resist the opportunity of getting Philip's Js out of him.
Thomas was badly cut when Mercato came to grief in the opening race and he missed out on a winning ride in the last event aboard His Nibs.
Joe Tizzard stepped into the breach and powered home His Nibs from Irish challenger Keepatem.