Thud is a general-purpose impact sound rather than a quote or character clip with one fixed origin. Short thud effects have long been common in video editing, cartoons, games and meme compilations as a simple way to suggest weight, contact or an awkward fall. Online, creators keep using them because they are easy to sync, instantly readable, and flexible across comedy, reaction and gaming edits. It fills a different role from the sharper metal pipe clang or a dramatic Vine Boom, aiming for a more grounded hit.