The 'Fanum Tax' refers to the act of a friend taking a portion of another person's food, a term popularized by the American streamer and AMP member Fanum. The meme originated from his frequent 'taxes' on fellow streamer Kai Cenat’s meals during live broadcasts, where Fanum would burst into the room and claim a percentage of whatever Kai was eating. It quickly evolved from a niche inside joke to a pillar of Gen Alpha slang, often associated with the broader 'Skibidi Toilet' and 'Rizz' subcultures. Today, the meme is used across social media to humorously justify food theft or to highlight the chaotic energy of the AMP streaming group.