To give a good shagging to.
Refers to the famous scene from the James Bond movie 'Thunderball' where he shags the stretcher table hard.
Shit man, I'd Thunder-ball her!
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The feeling when you haven't ejaculated in so long that they start to feel like your balls are going to explode.
When Mark decided to stop masturbating, he had no idea of the pain of thunder balls and was sorely unprepared for the pain ahead.
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When your balls clap against your thigh or your taint and it resembles the sound of thunder.
Man I got thunder balls so hard the other day when I was getting out the shower and I slipped and my balls hit my taint.