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1.
A fictional character created in homage to "Hard Gay" from the Japanese television shows. Hard Water is a man who only wishes to spread his knowledge of chemistry to students across the world.
"Hey did you guys see Hard Water?"
"Yeah! I've never felt so enlightened!"
by hardwaterfan June 27, 2009
 
2.
Ice.
What is hard water? Ice.
by Poptarty August 31, 2008
 
3.
agua ardiente a mexican drink mostly prepared at home.
my mexican friend has got so much of hard water that we were drunk for weeks.
by babanash June 21, 2006