Esse bandeirinha é louco is a Portuguese-language football meme sound that circulates online as a short, shareable reaction clip rather than a line tied to one famous broadcast moment. Its appeal comes from a very specific Brazilian football frustration: the assistant referee, known as the bandeirinha, becoming the target of fan anger after a disputed call. Because the phrase is short and the delivery is so emphatic, creators reuse it across football edits, reaction videos and social posts whenever a flag decision looks absurd, keeping it alive as shorthand for refereeing chaos.