The riff comes from "Bad to the Bone" by George Thorogood & The Destroyers, released in 1982. Over time, the opening guitar phrase became a standalone meme sound online, especially in edits featuring skulls, skeletons and exaggerated cool-guy reveals. Its spread came from the riff being instantly recognizable and easy to sync with a single visual gag. It is still widely used because a very short clip can communicate irony, swagger and old-school tough-guy energy without any spoken line.