Tea (slang): the best gossip, typically shared between friends. It’s a bonding tool for people of all ages. “Tea” is usually about someone you know, but it can also extend to celebrities’ scandals, etc. (Urban Dictionary, 2018)

Originally from “Spill the tea, " the act of sharing juicy gossip. 

“Tea” was actually “T” in truth which became popular after Ru Paul’s Drag Race (2010s). 

Some consider “Spill the tea” to be the American version of Britain’s century-old phrase “Spill the beans” (to share a secret), but it seems like “Spill the tea” is leaning more towards “gossip.” 

After I go back to my middle school on Teacher’s Day (gathering occasions in general) every year and meet all my classmates, some of my friends who didn’t make it will say “Time to spill the tea sis,” or “Did you get any extra hot tea today?” or I just start with “Girl, prepare some tea.” It usually includes someone’s dramatic relationship, someone who got cheated on, or got pregnant and then had to get married.