Top definition
So basically a water heater is anyone that is not the brightest, or in other words is non-intelligent or retarded.
Stacy: You wouldn't believe how much of a water heater joey was being

Georgia: I can believe it, he's always being a water heater
by Jordenisjesus April 03, 2017
Get the mug
Get a water heater mug for your guy Riley.
buy the domain for your cat site