The phrase comes from everyday Spanish, where hocico means an animal snout, so callate el hocico is a deliberately rude and funny way to say shut up. The misspelled form ocico is how the clip circulates on user soundboards, matching how people search for it phonetically. At around nineteen seconds it is longer than most one line reactions, giving it a rant like quality that Spanish speaking meme pages, chat groups and video editors reuse whenever someone needs to be theatrically silenced online.