她说他是猫他说她爱猫
[tā shuō tā shì māo tā shuō tā ài māo]
This nickname describes two people in interaction with each other in form of pet-owner relationship where 'he' plays the role as a cat whereas 'she' acts as if she loves him just like a true animal-lover treats cats. An endearing yet playful way to present a pair of lovers