Hi Lucas, Do take note that these phrasal verbs are slangs and should be used in informal writing. When someone "screws up" (something), they ruin what they are doing through their blunder or stupidity. Example: I can't screw up my examinations this time. I have failed three times previously. Someone is "pissed off" when they are feeling angry. We ask someone to "piss off" when we want them out of our sight. Example: You ruined my carpet when I told you to stay away from it. Now I'm pissed off with you! Hope this helps. Cheers, Lance

I agree with the previous answers. But i'll add the following. "screw up" can be as a verb in a sentence: 1. He screwed up his knee when he fell. (screwed up= messed up = hurt) 2. He screwed his knee up when he fell. but it can also be used as an adjective like phrase: 3. That car is really screwed up (Damaged, ruined) 4. That is really screwed ups (strange, weird, wrong) "Screwed up" has a lot of meanings, but generally it means that something is not the way it should be because of damage or because it's not done the right (correct, or moral) way.

You're welcome, Lucas.

thank for the help, Paul and Jerry!

Interesting, Paul. Do you say "I'm mad with you"