The term appears to originate from the realm of gaming and online communities, specifically from a game or a series of games known as "Daredorm." Daredorm seems to be a game that encourages player interaction, storytelling, and possibly role-playing elements. "Happy Analversary" is a playful term that seems to refer to a celebration or anniversary of some sort, with "Lila Top" likely referring to a character or perhaps a participant in the game or community.
"Lila – one year of you on top? We couldn’t be happier." daredorm happy analversary lila top
Lila (often searched as Lila Top or Lila @ DareDorm) was a recurring performer for the brand during its peak years. She became a fan favorite due to her high-energy performances and her ability to handle the "extreme" dares that the site was known for. The term appears to originate from the realm