Bazinga became Sheldon Cooper's catchphrase on The Big Bang Theory, the CBS sitcom that ran from 2007 to 2019 with Jim Parsons in the role. Writers used it to signal that Sheldon thought he had fooled someone, and the word quickly moved from episode dialogue into merchandise, memes and everyday fan quoting. As clips from the show circulated online, the single word was isolated as a reaction sound, reused far beyond the original scenes to mark any smug gotcha moment, successful or not.