From Longman Dictionary of Contemporary Englishhigh and mightyhigh and mightyBOASTtalking or behaving as if you think you are better or more important than other people Don’t get high and mighty with me. → high
Examples from the Corpus
high and mighty• You know how it is up there on the throne of clouds occupied by the very high and mighty of communications.• Afterward he and Corinne went to the White House for lunch and mingled with the high and mighty of official Washington.• For the high and mighty only appear so because we are on our knees. 