The phrase is Brazilian Portuguese, with completamente louca meaning completely crazy in the feminine form, which is why the clip travels mainly in Portuguese speaking meme and WhatsApp circles before crossing into wider reaction edits. Its exact original recording and context are not widely documented, so it survives mostly as a detached soundboard clip rather than a quoted scene. That short, self contained madness is what keeps it useful, because editors can attach the label to anyone who is ranting, panicking or dramatically overreacting in a video.