When used in this context you mean a poison drink. Essentially any food or drink item can be used in this way, but the concept of poisoning tea, typically in a tea kettle is the most known method.
If Julian Assange helped Russia by publishing illegally obtained information and Putin gets his way Assange will be having "Tea" time soon.
You slap your girl in the face when she about to give you head and say "hears *slap* *slap* the mf *slap* *slap* D", referencing the infamous tik tok tea girl.
"I gave my girlfriend the tea last night and now I have no where to stay"