Definitions for fair game
prey, quarry, target, fair game(noun)
a person who is the aim of an attack (especially a victim of ridicule or exploitation) by some hostile person or influence
"he fell prey to muggers"; "everyone was fair game"; "the target of a manhunt"
Actions permissible by the rules.
A goal or an object that may legitimately be sought.
An acceptable subject of criticism, scrutiny, or mockery.
: a game that is fair, that does not involve cheating, etc.