* "Brew" is probably the most common. It's used for any hot drink, but especially tea.
* "Cuppa" is another very popular one, short for "cup of tea".
* "Rosy Lee" is a more old-fashioned term, often used humorously.
* "Char" (short for "charwoman's tea") is a less common term, often used in a nostalgic way.
The specific slang word used will depend on the region, the speaker's age, and the overall context.