The phrase comes from the clip title Sauna - É professor! Não é fácil não!, a Brazilian Portuguese exclamation roughly meaning it is not easy, professor. No reliable source work or speaker is documented for this upload, so the sound is known mainly through its circulation as a short reaction clip online. Its appeal is the emphatic delivery and the double negative at the end, which Brazilian audiences reuse for comic complaining. The sauna context in the title adds to the image of someone enduring heat while protesting how hard things feel.