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When one or both of a person's lungs become coated in cum.
Your sister coughed up a lungnut this morning after deep throating my ejaculating cock.
by fevertree99 June 03, 2010
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When you bust a nut into someone’s tracheotomy (neck hole) and the cum drips down into their lungs and then comes back as CUNY flem.
Bro I just busted a lung nut in Betty and coughed a huge load up.
by Big Betty Nutt May 30, 2018
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