The 'whaaat' line comes from Shenmue, Sega's story-driven action adventure game released for the Dreamcast in 1999 and famous for its fully voiced open world full of talkative NPCs. The clip is a bully character's surprised reaction, ripped from in-game dialogue and passed around on soundboards as a short gaming reaction sound. Its goofy delivery made it a natural fit for meme edits, where creators use it to mock confusion or disbelief. It stays popular because Shenmue's oddball voice acting has long been a source of internet jokes.