If something is not your cup of tea it is not something you enjoy or like very much.
Examples of use:
1. Bob and Sarah have invited me to a fancy-dress party, but it's not my cup of tea so I don't think I'll go.
2. Modern art is not my cup of tea.
3. Camping is not really my cup of tea – I prefer staying in a hotel.
This expression is common in British English. Have you heard anyone say it?
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