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1.
After furious masturbation for an extended time, the balls eventually become over worked and become dry/sterile.
Jared, after several years of excessive maturbation, has developed a severe case of dry balls
by cannabis maximus for all January 11, 2006
 
2.
When you are tired and/or are working in an environment with lots of artificial heating. The resulting dry and possible sore eyes can now be referred to as "Dryballs".

This is an affliction often suffered by contact lens wearers and those that like to party...a lot.
"My wife kept me awake all night and now I'm at work, staring at this computer screen for eight hours with the heating on full - I've got a major case dryballs!".
by Tomintwells December 13, 2010
 
3.
Of poor or questionable quality.
"Greg's joke just now was so damn dryballs."
by Shmaye March 02, 2009
 
4.
The word Dry ball tells a long story, but long story short. A Long time ago, a middle aged man’s balls been bitten off by a dog. So he put two golf balls in his shaft as the real ones. When he wants to play golf, he just take them out and play them as golf balls.
Dry ball sucker
by Dry ball sucker August 29, 2009