I Was Born To Be Wild But Only Until Around 9pm T-Shirt

This phrase is a playful and lighthearted way of saying that the person has a wild or adventurous side, but that it tends to fade or become subdued by around 9 pm in the evening. It's using humour to suggest that while they may have a free-spirited and adventurous nature, it's not a 24/7 characteristic; rather, it has its limits and tends to wind down as the evening progresses. The phrase plays on the idea of being "born to be wild," which usually implies a carefree and adventurous lifestyle associated with activities like motorcycle riding, travel, or other exciting endeavours.