In Brazil, the number 13 is the electoral number of the Workers' Party, long associated with Luiz Inácio Lula da Silva, so shouting 'É 13' is a direct show of support. The added 'porra' is a common Brazilian swear used for emphasis, making the phrase sound defiant rather than formal. Clips of supporters shouting it have circulated for years in WhatsApp groups, political memes, and election-season edits, especially when Lula is in the news, and it remains a quick audio shorthand for taking a side.