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1.
when a person is so far gone on a drug that they can no longer control themselves and lapse into a deep sleep from which they remember nothing of what happened.

The water is not gentle though it is a mental and physical state to avoid. A sensation like one is dying is typically felt. also people recall before they black out that they felt like they would lose control of their mind and body.

it is best to stay out of the water ladies and gentlemen...
Tim: "that chick just had six blunts 17 shots and now she's passed out on the floor"
John: "ya... she's in the water"
by a rochos June 12, 2011