Yah, tea bagging, as in slang for dipping a scrotum into one's partner's mouth.
Maddow's take:
http://www.youtube.com/watch?v=jB22gw09c6U
On OpenLeft, Mike Lux notes the confusion, and how "freaked out," conservatives are by the April 11 A New Way Forward Protests, which the right claims have been contrived to steal the thunder of their tax day 'Tea Bagging' protests a few days later. <http://www.openleft.com/diary/12760/national-tea-party-organizers-freaked-out-by-a-new-way-forward>
The ANWF protests actually have clear, simple goals. (Break up large banks after putting them into receivership.) The April 15, tax day, "tea bag protests" exist to therapeutically express some sort of vague, inchoate, anti-'socialism' sentiment.
-B.