Quarterbacks yell it. Gamers revel in it. Bros text memes and hashtags of it. And as displayed on live TV in the NFL regular season AND playoffs, even Travis Kelce's girlfriend loves it. How did a simple phrase transform from a Jumbotron clap-along into such a ubiquitous exclamation? With apologies to Tom Brady and Lil Jon, correspondent Jeremy Taché searches for the real GOAT of "Let's Go!"
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