The phrase comes from Surfin' Bird, a 1963 hit by American garage rock band The Trashmen, built around the repeated lyric bird is the word. It found a second life when Family Guy featured Peter Griffin becoming obsessed with the song, turning its relentless chorus into a running joke. Clips of the chant then spread across YouTube, TikTok and meme edits, where its catchy repetition made it easy to reuse. It endures because the hook is instantly recognisable and instantly signals playful chaos.