"Nom nom nom" is a long-running internet phrase used to represent cheerful eating, especially in memes, pet videos and short reaction edits. Rather than pointing to one definitive source, this sound is better understood as a widely shared vocal gag that spread across early meme culture and later into short-form video platforms. It stays popular because the meaning is instantly clear without context: something is being eaten enthusiastically. Creators still use it for food jokes, cute animal posts and exaggerated snack reactions.