This sound comes from the Reese’s Puffs cereal advertising jingle that repeated “Reese’s Puffs” and “eat em up” in a rap-like chant. Online, the short hook spread through meme edits, reposts and nostalgic compilations because it is instantly recognizable and easy to sync with jump cuts. It remains popular because it mixes childhood ad nostalgia with a funny, high-energy delivery that fits food jokes, absurd transitions and short-form videos.