1.) A statement expressing wishes to attend some sort of activity (i.e. We should all go to the movies sometime), but at the same time expressing no plans to actually organize such an event.
2.) Such a remark made as an insinuation that the person on the receiving end should plan said event.
"Adam said that we should go to the mall and hang out sometime."
"Really? When did he say to go?"
"He didn't, it was only a we should."