I don't know Portuguese, but from what I can understand the pun translates perfectly to Spanish. Incidentally, pun also translates to fart. – ¿Para qué sirve u

I don't know Portuguese, but from what I can understand the pun translates perfectly to Spanish. Incidentally, pun also translates to fart. – ¿Para qué sirve una barriga vacía? – Em, ¡Pa' nada!"