Carterista is the everyday Spanish word for a pickpocket, and in Barcelona it is heard in metro stations and busy tourist areas as a direct warning to watch bags and phones. Short clips of people shouting the word at suspected thieves spread on social media as travel advice and as comedy, because the warning is understood even by non-Spanish speakers once pickpocket is added in English. That double naming helped the phrase travel beyond Spain, where creators now reuse the shout as a general meme signal for stealing, sneaking or getting caught in the act.