Flag waving is done by typing /f [country code]
in the chat, where "country code" is the case-insensitive 2 letter country code. However as long as the first two letters are correct, the correct flag will be shown (ex: "france" / "frnc"). Typing in an incorrect country value will result in you waving a stick. Any values less than 2 characters are simply result in you waving the flag the server detects as yours.(confirm)
Example: /f fr
to wave the french flag.