David Shusters

Rachel Maddow on Friday played a video of a man in underwear banging his genitals against another man's forehead in a gay bar. This was done to explain to her MSNBC audience the derivation of the term "teabagger," the sexually-charged double entendre that sadly became popular this spring and summer as Tea Parties swept the nation. According to Maddow, "This is where "teabag" comes from. This is a…