Motoboy is the Brazilian Portuguese word for a motorcycle courier, a familiar figure in Brazilian cities who delivers food and packages through heavy traffic. The phrase 'não mexe com motoboy' plays on respect for that job, turning a street warning into a joke about loyalty and toughness. Online, the line circulates in short meme videos and reaction clips, where creators use it to defend riders, mock an overconfident challenger, or add attitude to a delivery scene. Its staying power comes from that simple, repeatable warning, which works even for viewers who only catch the tone.