Largely self-explanatory. A buttfucking democrat is a wildly liberal individual, who may, in many cases, actually engage in sodomistic acts. Buttfucking Democrats usually infest large cities where they spread diseases such as syphilis and genital warts to other buttfucking Democrats.
Rush Limbaugh: So, caller, what do you think of Obama?
Caller: He's a buttfucking Democrat.