The phrase comes from Brazilian politics, where 13 is the electoral number of the Workers' Party and Lula lá has been used as a campaign slogan since Lula's 1989 presidential run. The short chant version circulates online as a soundboard clip, shared in election seasons, football-style political rivalries and WhatsApp groups. Its appeal is its simplicity: a name, a number and a singable hook that Brazilians recognise immediately, whether they use it sincerely to back Lula or ironically to mock the chant itself.