Sub obrigado is a short Portuguese-language thank-you phrase used widely by online creators in Brazil and Portugal, rather than a line tied to a single show, film or celebrity. The phrase combines a shortened reference to subscribing with obrigado, the Portuguese word for thank you, making it instantly recognisable to Portuguese-speaking audiences. Its popularity comes from its brevity and clarity in short-form videos and livestreams, where a one-and-a-half-second acknowledgement fits neatly over alerts and outros without slowing the pace.