What is killed by amphibious mmm means?

What happens if a tank or PC is shot up and/or killed by a another tank or PC that is hiding in the water. Such as in any war game played online.

Person 1: Daaah use your 50 cal to kill that PC.
-Dies-
Person 2: Damn I'm dead.
Person 1: lol PC killed by amphibious mmm means

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killed by amphibious mmm means - video