Cero Metralleta comes from Bleach, where it is known as an attack associated with Coyote Starrk. Short attack callouts like this spread widely through anime compilations, versus edits, and meme videos because they deliver instant context and energy in just a second or two. It remains popular in fandom spaces because even viewers who do not know the exact scene can still recognize it as a classic anime battle shout. It fits especially well beside other dramatic anime cues such as To be Continued (jojo).