Ok So I bought coins that are now expired.
Does that mean that they cannot be traded and I have lost all the Bitcoin I invested in them?

What do you mean expired?
What coins?

Do you mean that their blockchains have stopped or what?

Or maybe the coins which he bought already got delisted from exchange sites?
That "expired" kinda confusing what actually he means

Probably the coin was delisted and has not met the minimum trading volume for a certain period.

That was i mean, but still have no idea with "expired", the only thing comes to my mind was the coin got delisted and he can't sell his coin