'Hi Barbie' has been the signature greeting of Mattel's Barbie doll world for decades, exchanged between Barbie and her friends in toys, cartoons and ads. It exploded into meme culture around Greta Gerwig's Barbie film in 2023, when the cheerful call-and-response of 'Hi Barbie' and 'Hi Ken' became a TikTok staple for greetings, reveals and pink-themed edits. The line now works as a standalone reaction sound, instantly signalling playful glamour and in-on-the-joke nostalgia wherever it pops up online.