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The only sense of 'swept out' I can think of applies to surfing in the sea - taken away from the shore by a current.
Perhaps skate-boarders have mistakenly borrowed surfers' jargon: when a surfer is knocked off his or her board, it is said to be a 'wipe-out'. This can become a verb: "I was wiped out by the big wave". But I really don't know about the jargon either of surfers or of skate-boarders, so I could easily have guessed wrong.
i got swept out 
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