Cheese tax grew out of a running joke among pet owners online, where animals are treated as tiny officials collecting a toll whenever food appears. TikTok helped the idea spread through short clips of dogs and cats hovering, pawing or staring while their owners ate, and viewers began repeating the phrase for any pet that expected a bite. The humour comes from giving an everyday begging moment a formal, almost bureaucratic name, which keeps the sound useful long after individual trends fade.