“Who are ya?” seems a popular chant or taunt with English football fans, both on and off the stands. Is it a fair assessment that it means to diminish the opposition as unknown and insignificant?
What are the guidelines to its usage? I understand why it is being chanted when the opposition is announced before the match, but I’ve also heard it being used when someone on the opposing team stumbles, or makes egregious error, or otherwise fails conspicuously. Is there specific reason for this, or it was somehow adopted just because it is neat chant? Can it be used against officials? Can it be used against unpopular management (e.g. if the coach or club president present at the game is announced) or players (that had angered the supporters’ community) of own club?
Where did it come from? Is it used by football fans only, widely used across different sports, or it varies? Was this used somewhere outside of football/sport context? Is there any date to its origination or when it started to be used profusely?