Zoinks comes from Scooby-Doo, Where Are You!, the animated series that debuted in 1969, where it became the signature exclamation of Shaggy Rogers whenever a ghost or monster appeared. Decades later the line was lifted into short meme edits, sped up and paired with modern reaction slang like OMFG. That combination of a familiar cartoon voice and an oh my god style panic made it easy to reuse out of context, so it now circulates in sped up soundboard clips, TikTok edits and reaction videos whenever a reveal feels absurdly alarming.