Someone who is paid to endlessly post talking points, rhetoric, and propaganda to internet forums and blogs. Because the right-wing is more organized, freepers almost always espouse a right-wing neocon perspective. Also, freepers will almost always mindlessly defend the "moron-in-chief" even when it is clearly unwarrranted. The word "freeper" is derived from the term for users of the ultra-right-wing freerepublic.com website.
The freeper made numerous posts defending the sham "president", but was unwilling to admit that he was being paid so that people would think that his opined views were sincere.