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."
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.