The phrase comes from Johnny Depp's testimony in the 2022 Depp v. Heard defamation trial, where he described drinking wine and used the term mega pint for a very large glass. The exchange was clipped and shared widely online, where viewers latched onto the unexpected wording and Depp's matter-of-fact tone. It quickly became shorthand for any comically large drink, and creators still reuse it because the short clip needs no context to land as a joke about excess.