The phrase comes from Brazilian Portuguese slang, where deixe de ideia is a dismissive way to tell someone to drop an idea, and orelha seca is a teasing nickname added for comic bite. Shared as a standalone voice clip on meme soundboards and in WhatsApp style exchanges, it spread because the line works without context and can be dropped into almost any conversation. Its popularity rests on that mix of familiar street slang, exaggerated delivery, and instant recognisability among Portuguese speaking audiences online.