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The act of clenching ones buttocks around an object. Popular in ancient times, "Byrnies" were known for their powerful squeeze and highly sought after in romantic encounters. However, upon the arrival of the conquistadors, byrnsides died out after a particular powerful byrny successfully pinched the genitals off of a would-be rapist.
Baby, when I'm ready I want you to byrnside the shit out of me!
by CSWhitlock January 19, 2017
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