Skelly is online slang for a skeleton character, and short warrior battle clips like this spread through gaming edits, Halloween posts and meme soundboards where a two second cue is easy to reuse. With no clear single film or game source attached to this version, its popularity comes from how instantly it signals undead trouble without needing dialogue or setup. Creators reuse it across spooky season compilations, fantasy parodies and skeleton versus skeleton jokes, and its rattling bones make it recognisable even when played over unrelated footage or still images.