TNC (noun) stands for toke and choke, applied to someone who consistently fails to inhale any amount of cannabis smoke without coughing up a lung or two.
Person1: "hey man pass the joint"
Person2: "here you go man"
Person1 *attempts to smoke weed, and coughs for 10 minutes*
Person2: "you motherfucker TNC you just wasted my weed!"
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