P.O.S.

'P.O.S.' refers to something that is a 'piece of shit.' It is usually used to describe an old car, but can be used for other things as well. It is pronounced letter by letter, not as one word.

Example:
-Dude, you really need to get a new car!
-I know! I'm so sick of this P.O.S.!

Same old, same old

'Same old, same old' is a rather unenthusiastic and perhaps somewhat negative response to the question, "How are you?" It means that nothing has really changed.

Example:
-So, how are you doing? I haven't seen you in such a long time!
-Oh, you know. Same old, same old.