: In various online subcultures, "moo" can be a nickname, a slang term, or a specific aesthetic descriptor, but its meaning in this context likely refers to a specific individual or a sub-category of content.

Megaupload was a major Hong Kong-based file-sharing platform founded by Kim Dotcom in 2005. It became the 13th most popular site on the internet before being shut down by the FBI in 2012 for alleged massive copyright infringement. Contextual Terms

"Megaupload ladyboy moo" appears to refer to a specific category of adult content or a niche community of performers, often associated with Thai culture, that was shared or hosted on the former file-sharing site .