The line comes from the 2006 drama The Pursuit of Happyness, starring Will Smith as homeless salesman Chris Gardner, based on Gardner's memoir. Near the end, after securing a stockbroker job, his narration calls that brief period happiness. The Portuguese dubbed phrasing, 'essa parte da minha vida se chama felicidade', spread widely in Brazil through WhatsApp shares, edits and social posts. Its mix of sincerity and melodrama lets people use it both genuinely for milestones and ironically for tiny everyday wins.