Sike is a slang variant of psych, long used to mean just kidding after a trick statement. The word found a second life on Vine, where six-second clips built entire jokes around a fake announcement followed by the reveal, and the format carried over to TikTok, YouTube Shorts and meme soundboards. Because the clip is short, instantly understood and tied to a familiar prank structure, editors still use it to punctuate bait-and-switch moments, fake news-style captions and playful teasing between friends.