The phrase is everyday formal Portuguese, shortened in the title to mto obrigado srs, and it circulates online as a short voice reaction rather than a song or scene quote. Its exact original recording is not documented, so it is shared mainly through soundboards and chat clips. People reuse it because the respectful address to a group feels bigger than the moment it answers, turning simple thanks into a small ceremony. That makes it handy for Brazilian Portuguese speakers and meme editors who want gratitude with comic politeness.