The phrase combines two huge gaming memes: Fortnite, Epic Games' battle royale released in 2017, and sussy, slang that spread from Among Us when the game surged in popularity in 2020 as shorthand for suspicious behaviour. Mashing the two together became a common form of ironic gaming humour on TikTok, YouTube and Discord, where meaningless crossover phrases are repeated in deadpan voices for effect. This short clip follows that format, which is why it is shared less as a Fortnite effect and more as a general meme reaction.