The phrase let him cook spread widely on social media in the early 2020s as slang for letting someone continue without interruption, especially when an idea sounds strange at first. The hol up version adds a stop gesture in audio form, so editors use it as a reaction beat before a reveal, a long explanation, or an unexpected success. It became a staple of meme edits, sports clips, and gaming highlights because it frames ordinary confidence as something worth protecting and watching through to the end.