The phrase comes from the Portuguese language experience of Waze, the GPS navigation app widely used in Brazil for driving directions and traffic updates. Clips of its spoken prompts began circulating on soundboards and messaging apps, where short familiar lines are reused outside the car as jokes. This one survived because estamos prontos works in many everyday situations, from leaving home to starting a game. Its popularity is less about navigation and more about borrowing an official sounding voice to announce a very ordinary moment.