i won't hold my breath - You say this when you're so fed up that you're ready to give

You say this when you're so fed up that you're ready to give up and probably take a nap instead.

Your friend: I won't hold my breath. Because you still haven't cleaned your room.

Your crush: I won't hold my breath. Because you're still waiting on that pizza.

Your brother: I won't hold my breath. Because you still haven't finished that homework.