Best served piping hot, tea is slang for "gossip," a juicy scoop, or other personal information.
Meaning and Examples of the Slang Term 'Mug
What do you mean by Tea?
How bubble tea, or boba, went global – and who first thought of putting chewy tapioca balls in it?
The Origins of Boba Tea
67 TikTok Slang Meanings Every Parent Should Know
Decoding Spill the Tea: The Evolution, Usage, and Impact of a Popular Slang - Neon Music - Digital Music Discovery & Showcase Platform
Tea Meaning, Examples & More
What 'tea is tea' meaning here? : r/EnglishLearning
On the origins of that's the tea, Chalkmagazine