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Third lung syndrome. When, instead of a brain, a person has a third lung [in the space] where their brain [should be]. Unfortunatley, this means they have a bigger air capacity, allowing them to talk more, but because they have no brain, they don't have the ability to think through about what they're going to say first. A common name for somebody with TLS is airhead. Which is ironic because lungs [of course] breathe in air.
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