It was removed as it was reported several times and was too political. Do not bring up the topic again. Please review the rules if you have any questions.
No, that means just what it says, the user (whoever you sent it to) has a full PM box and needs to empty it! They can fill up fast, especially when you add up the combo of the inbox and the sent messages (if you choose to save them).
Also remember we are all here to learn and share. Lessons can't be taught by sarcasm, condemnation, or other harsh words. Consider any question posted here is from someone who is seeking knowledge, letting them 'have it' because you think they're ignorant, or 'too stupid' to learn, or are in...