The phrase itself comes from pilot and aviation slang for checking an aircraft and getting ready to depart, and it has long been used as a lighthearted way to say it is time to go. Online it took on a second life as a short audio clip shared on soundboards and in memes, where its confident, old-school tone makes a perfect intro. Creators keep returning to it because it packs departure, excitement and attitude into a single line, and it works just as well for cars, trips and everyday getaways as it does for planes.