Conjunctive phrase describing the mania around the release of Gretta Gerwig's Barbie adaptation and Christopher Nolan's Oppenheimer, which both release on July 21st, 2023. Due to both films being long expected, many people plan to see both films back to back, spawning jokes related to how opposite the topic and tone of both films are.
"Hey bro, are you going to cosplay for the Barbenheimer premiere this weekend?"
"You bet I am: I have my suit pressed and my girlfriend's pink high-heels ready to go."
commonly used for movies “Barbie” and “Oppenhiemer” releasing on the same day (21st July 2023) its a type of duo name for people trying to refer to both movies without having to type both names out