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A shortened version of "Pacific Northwest", an area of the United States.
Steve Pool: "Today in the pac nw it will be rainy... again."

Man watching TV: "Well isn't that special... I never would've thought it would rain in Seattle. Gee Willikers!"
by The Intellectual Talking Dog July 07, 2008
Pacific Northwest (Washington, Idaho, and Oregon)

Pronounced "Pack-En-Dub"
Born and raised in the PacNW, therefore I do love the rain!
by Andrea Rose December 25, 2006