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It is when you are having sex with your woman from behind. Then when you ejacuate into the condom you blow up the condom to the size of a balloon and surprise her by breaking it in her face and the semen goes everywhere.
I gave my girlfriend a great ballymun balloon last night. She was not a happy camper.
by robbieD26 February 05, 2008

Words related to Ballymun Balloon

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