n.: A party intended as a celebration of all things white trash. It typically involves wearing your trashiest attire and consuming suitably low brow food.

The name is originally derived from the trophy presented for best outfit. A combination of a bobble head version of the Rock mounted on a can of Spam.
"I'm going to bring some ambrosia salad to the Spamrock tonight."
by Toxin September 7, 2004
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