best boy—
1. (coll.) one’s favorite friend:
- “I was his best boy,” Auguste told The Sunday Age. “I miss him dreadfully as a companion.”
2. (Film or TV production) assistant to the chief electrician:
- The gaffer’s assistant answers to the amusing title of best boy!
best man—the groom’s aide at a wedding:
- Who will be your best man when you get married?
Note: Neither expression correlates in meaning with the phrase best people—people of high social standing:
- There are other hotels, but I couldn’t tell you much about them: they’re not patronized by the best people.