The phrase comes from the Postal Dude, the sardonic lead character of the Postal video game series, which became known for dark, exaggerated comedy rather than straightforward action. As short voice lines from games began circulating on soundboards and in short-form edits, this polite farewell stood out because it could be lifted cleanly from its original context and reused as a punchline. It remains popular because it is instantly recognisable to players, lasts barely more than a second, and works as a cold, funny sign-off for almost any chaotic clip.