La vendedora de rosas is a 1998 Colombian drama about children selling roses on the streets of Medellín, and El Zarco is one of the tough figures in that world. The phrase una loca comes from that setting, where blunt street speech is used to call out someone behaving erratically. Shared as a short clip on soundboards, it travelled beyond the film because Spanish-speaking meme makers recognised the tone immediately, even without seeing the scene. It survives as a compact reaction, useful whenever a single dismissive label says more than a longer explanation.