What is don't have too much fun without me?

"Don't have too much fun without me" is a phrase, often used playfully, to express a mild sense of exclusivity and good-natured jealousy when someone is missing out on a fun event or gathering. It conveys that the speaker would have liked to be present and share in the enjoyment. The phrase often implies a desire to be included in future occurrences. It's a lighthearted way to maintain a connection and express a feeling of missing out without being overly demanding or serious.