wild and crazy

"Wild and crazy" is used when simply saying "wild" or "crazy" to describe a person or situation doesn't fully describe the huge degree to which that person or situation is "off the rails" , uncontrolled or manically wacko. Could have a positive or negative connotation. Someone who is saying and doing random or extreme things could be said to be wild and crazy. Or if you had an awesome night partying with all sorts of different exciting things happening that could be said to have been a wild and crazy night out, to use it in a positive meaning.