Noun; a person that only/perfers smoking substance (marijuana mostly) when the smoke being inhaled has been flitered naturally through water (perculators). Such as water bongs.
Smoker 1:"Wanna smoke with us, we got hella joints and blunts"
Smoker 2:"Nah, I'm a water smoker"
Smoker 1:"Its cool dude, we are brings a water bong too"
Smoker 2: "Oh fasho, I'm in"