If you are looking for information on exploring intimacy—specifically involving (often referred to colloquially) or within the context of trans-feminine (ladyboy) identities —the most "useful" content focuses on safety, consent, and technique.
The body does not naturally lubricate in that area. Using a high-quality, water-based or silicone-based lubricant is essential to prevent discomfort or injury.
The phrase "ladyboy moo ass play" is somewhat ambiguous and could refer to a few different things. To provide the most helpful response, I’ve focused on the most likely interpretation: within the LGBTQ+ and trans community. Sexual Wellness and Safe Exploration
If "moo" refers to the Thai word for pork ( mu ), you might be looking for content regarding Thai street food or culture involving trans performers, though the "play" element makes this less likely.
Before any play, discuss boundaries, likes, and dislikes with your partner. Mutual respect is the foundation of any healthy encounter.