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1.
Sliding rapidly forward on your feet while being pulled by a power kite.

From the nautical definition meaning to run before the gale.
"Dave lost his balance at a crucial moment and scudded along on his arse."
by tttonyyy April 19, 2005
 
2.
A sexual activity involving some preparation. One participant among a couple or group eats a high protein diet for a number of days resulting in a rock hard poo. This can then be "fired" up the partners anus, when both are bent over bottom to bottom, in the fashion of a scud missile being launched.
I think Denise and Ricardo enjoy scudding quite a lot.
by Ed1819 April 11, 2008