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Your balls become inert when you get the aching and sore feeling after they have been hit or after you have had a session of intense masturbation.
"Dude, I was jerking off to Stacy's mom 15 minutes ago and now my balls are inert!"
by speckd November 14, 2007
What the balls are. (It doesn't make a bit of difference, guys.)
"The balls are inert...!" - Piccolo
Really though, inert means doing nothing.
by Yams March 05, 2007
When somebody is asexual or frankly is not horny at all.
My girlfriend is inert, she doesn't wanna have sex.
by Shaqqas Sanafi August 18, 2008