Quote:
Originally posted by Iron_Ranger:
I believe its some sort of an obsctruction in your kidney. I know one of the ways you can get them is by eating too much junk food and too many sodas and such.
Great quote 
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Basically they are large balls of calcified sodium that can build up in your kidneys/urethra if you eat too much salt and don't drink enough water. Pissing them out (ie: 'passing stones') is pure agony apparently.