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1.
1) To be laying in a state of relaxation, especially on a piece of furniture.

2) To be passed out, especially on the floor.
Q: "What are you doing?"
A: "Nothing, I'm just crashed out on the couch playing Halo."

Q: "Where's Luke."
A: "Fool's crashed out on the floor in the bathroom."
by JamesMonet January 26, 2006