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When an individual evacuates (to avoid a storm or hurricane) to a location to stay with one that they have previously shacked with, or plan to shack with during the evacuation. A shack-evac typically occurs with an individual from a different area code than the shack-evacuee.
Valerie: What are your Hurricane Gustav evacuation plans?
Courtney: I think I am going to shack-evac to florida boys house.
by c.mahler August 27, 2008
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