Someone's who's washed (out) might be burnt out, exhausted, or, if they're a drug user, extremely high. More tragically, if they're washed (up), they might be over, i.e., canceled, passé, or not cool anymore.

What does washed up mean in slang?

If you say that someone is washed-up, you mean that their career or success has ended. [informal] He's all washed up, but he still yells at everyone. 'washed up'

What is wash slang for?

—used to say that something is equal and that one side does not have an advantage You won the first game and I won the second, so it's a wash.