What is the definition of Waterproof Weapon?

A 'waterproof weapon' is like a superhero sidekick, except it's a metal can with a gun inside. It's designed to withstand the mightiest of floods without letting the enemy see your face or hear your laugh. Imagine a sniper rifle strapped to a suit of armor that can survive being drowned in a bathtub. That's basically what a waterproof weapon is!

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Now, here's an unsettling example sentence: "The baddie's new waterproof grenade promised to blow up the whole city, but it was just a fancy way of saying, 'I'll just drown you in the nearest pool this time.'"