"Blew them out of the water" is a colloquial term that means you did really, really well. It's probably American: It's supposed to harken the notion of dropping torpedoes or bombs onto enemy warships and striking them at a vulnerable point, like the powder magazine, which causes the entire ship to explode and sink rapidly: A direct hit in other words. On occasion, ships hit in this fashion are said to lift up out of the water from the force of the blow before sinking.
The sinking of the H.M.S. Hood during World War II by the German battleship Bismarck is a solid reference.
Anyhow, history lesson aside, you had some really really good rolls there.