Little is known about the original recording behind this clip, so its history is mainly online rather than from a confirmed film or show. The sound circulated on user soundboards under the misspelled name Mokey Turtle, where the extended hummm became the searchable hook. Short reaction clips like this spread because they can be reused without context, and this one stuck for turtle memes, blank stare edits, and puzzled animal videos where a brief thinking noise says more than a full line of dialogue.