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1.
When something you are using or own is stolen/taken when you are not looking. Comes from how animals, mostly birds of prey will swoop in and kill/pick up prey or take stuff that is lying around to eat and/or make a nest out of.
Person 1 "Where are those magazines I was reading before I went to the bathroom?"

Person 2 "They got swooped on by John a few minutes ago."
by IceWarm March 14, 2006