With a little help from some folks at Rigorous Intuition I've finally figured out how "Scooter" Libby got his nickname.
Y'all that have a cat or a dog know how it will drag itself across the carpet when it's got dangling hemorrhoids or after an attack of diarrhea? They sorta "scoot"; don't they--dragging their poopchute across the rough surface?
Well that's it.
Ol' "Scooter" has been takin' it up the butt from Bush and Cheney so much lately that that's the only way he can relieve the discomfort.