Shaddap is a slang spelling of shut up, long used in comedy and everyday speech as a blunt, impatient way to tell someone to stop talking. As a one-second clip, the second version circulates mainly as a short reaction sound for memes, edits and chat replies, where its brevity makes it easy to drop into a joke without breaking the pace. It sits alongside other blunt silence reaction clips that creators use to cut off noise, arguments and overlong rants with a single comic interruption.