There is no widely documented source for this clip, so it is best understood as a piece of internet shorthand rather than a quote from a known show or film. The word 合法 is common in Mandarin-language memes, where declaring something legal became a running joke for blessing chaotic or borderline behavior. Short voice memes like this travel well because they need no setup, and creators outside Chinese-speaking communities now use it purely for its confident tone, even when their audience only reads the meaning from context.