noun. Ouch. Or, woohoo! Depending on the thwackee.
Real citation: "Golly! I hit the cages again tonight and was mighty improved fom yesterday. I saw the ball better and got my legs and hips into the swing much better. I'm still hitting better from the left side, but once I started focussing on the ball and its proper state of thwackitude, I started making very respectable contact."
(Liam, May 11, 2005, http://heylisten.blogspot.com/2005/05/south-will-never-rise-agien.html)
Made-up citation: "I hope Jackie Chan is enduring minimal thwackitude in his movies these days. Dude deserves a break."