Junkrat is the explosives-obsessed damage hero from Blizzard's team shooter Overwatch, released in 2016, famous for grenades, traps and his RIP-Tire ultimate. 'Vai explodir' is Brazilian Portuguese for 'it's going to explode,' and the line circulates online as a meme warning sampled from Portuguese-speaking Overwatch content. It spread through gaming montages, TikTok edits and soundboard sites where short multilingual voice lines are prized for comedy. It endures because the meaning is obvious even without translation, and Junkrat's manic energy makes any incoming explosion feel funnier.