I'm screwed.

are you in china ? and can you speak english ? did you have msn? I'm su ki study english now

HI ARE

when some bad things happened,and he or she doesn't how to deal with then ,Chinese will say 要死了，完了，完了，

People say this if there is something bad going on or they assume to get a bad result. For example, if you haven't prepared well for the exam when the teacher said the exam is on tomorrow, you may say, 要死了/我完了, as you think you'll get a bad result.