The phrase “head honcho” refers to anyone who is the leader of something, like the principal of a school or the CEO of a company.
The Japanese word hanchu means “squad leader” (han=squad, chu=chief). During the Korean War (1950-53), American soldiers changed the spelling to honcho, and added “head,” probably because head honcho made a catchy phrase. Today, a head honcho is the principal of a school, the owner of a business, or anyone in charge.
Here is the idiom being used in a sentence:
Kevin better do what the head honcho tells him to do if he wants to keep his large office.