Yavana is a common Kannada question form meaning who is this, and this clip is shared in its sharper sense of who is this idiot. Short regional language dialogues like this travel widely on soundboards and in WhatsApp groups because the emotion is clear even without translation. Kannada movie and comedy lines are often clipped into reaction sounds, and this one has settled into use as a teasing response to an unknown person, an odd comment, or an unwanted appearance in a video or chat.