best boy
Noun
Meaning
(film production) The first assistant to either the key grip (in charge of camera placement and movement) or the gaffer (in charge of lighting and electrics).
(fandom slang) A reader or viewer's preferred male character.
Source: en.wiktionary.orgSynonyms
Examples
Sometimes the gaffer is credited as chief lighting technician. ; Best boy (lighting) : The best boy is the chief assistant to the gaffer.