As Ray Fisher recalled to THR, Justice League producer Geoff Johns, who’s been a key DC Comics contributor for over 20 years now, approached director Zack Snyder about including “booyah” in the movie, a word that Cyborg has never said in the comics.
Snyder declined, as he reportedly didn’t want catchphrases in Justice League, but he still stamped the word on some signs in his cut of the movie as an Easter egg.
According to Johns’ representative, Warner Bros thought the line would be a “fun moment of synergy,” but Fisher felt that it would be weird for the only Black superhero in Justice League to exclaim a catchphrase, calling to mind sitcom characters like Arnold Jackson from Diff’rent Strokes and J.J. Evans from Good Times.