The line comes from Die Hard from 1988, where Bruce Willis as NYPD officer John McClane uses Yippee-ki-yay as his wry catchphrase, most famously followed by a profanity in his radio taunts to the villains. McClane repeats variations across the sequels, cementing it as an action-movie signature. The clean short version spread through soundboards, ringtones and meme edits in the 2000s, where it became shorthand for a cool, underdog victory. It endures because the delivery is instantly recognizable even without the rest of the quote.