Noun
(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.orgSometimes the gaffer is credited as chief lighting technician. ; Best boy (lighting) : The best boy is the chief assistant to the gaffer. Source: Internet