Dafuq is internet slang for a baffled 'what on earth just happened,' written as one compressed word and spread through forums, image macros and short video edits in the early meme era. Because the phrase itself is the joke, the clip circulated without a single confirmed source and became a generic reaction sound. Creators keep reusing it on TikTok, YouTube Shorts and gaming clips where a caption alone feels too flat, and the misspelled search dafug meme shows how people often look for it by sound rather than spelling.