Dog water is a term used most commonly by 9-year-old Fortnite players. This is an immaculate insult perfect for both hurting your opponent and stunning them with your impressive vocabulary.
You're dog waterkid I can box you like a fish. Get out of my lobby!
"Hey do you have some water I'm thirsty"
"I do have some SPICY water, if you think you can handle it"
"Please dude, I've been drinking spicy water since before you could walk"