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A contraction of His Honor. Not city-centric, but used regularly in New York City newspapers, usually to set an informal tone about a public official.
"Hizzoner would have none of it."
by Customer1 December 14, 2005
In Detroit, a sarcastic reference to Kwame Kilpatrick, the man who dubbed himself the "hip hop mayor."

May also be used to describe others who bring a "ghetto" or low class ethos to an otherwise-esteemed position, particularly in government.
It was recently disclosed that other cities' police forces refuse to guard Hizzoner after hours because of his unethical behavior.
by Ben January 24, 2005