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1.
1: (n) A vacation taken in the form of a long and relaxing shit. Usually refers to one who has disappeared at their place of employment while still on the clock.
BOB: Hmmm. Has anyone seen our co-worker Wally in the last hour or so?

MIKE: No but I saw him head into the shitter quite awhile ago. He must be on defevacation.
by Mike and Wally May 17, 2004