It's important to note that this phrase is likely meant to be slightly humorous or teasing, especially if said to someone who knows their cat is a bit overweight.
Here are some ways to understand the intention:
* Lighthearted banter: If said in a playful tone, it might be a way of making a joke about the cat's weight.
* Concern disguised as humor: The person might be gently suggesting that the cat needs to lose some weight, but using a humorous approach to avoid being overly critical.
* Direct criticism: In a more serious tone, this phrase could be a direct criticism of the owner's feeding habits and lack of exercise for the cat.
The exact meaning depends on the context, tone of voice, and relationship between the speaker and listener.