Fanum Tax is a slang term that has recently become popular on social media, particularly on TikTok. It was coined by the comedy creator Fanum, who is a member of streamer Kai Cenats influencer crew AMP. The phrase refers to the way Fanum would jokingly "tax" other members of AMP in 2022 by taking bits of their food when they were eating. The term is used anytime someone wants to yoink your food, and it has since picked up in popularity. The phrase is also used somewhat ironically by older creators to poke fun at the younger generation who overuse internet slang.