(Not to be confused with "to be done with stng")
I've seen several times the expression "to be done for", not followed by anything. Here is an example not so far from what I could actually read or hear:
- John, the boss wants you to send the client a complete proposal by 6 today. - Gee... I'm done for.
My understanding is that this means "I'm scr**d/ruined", and probably less derogatory than the first. Is this correct, and is this the only usage of this expression?