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The text equivalent of a heart attack, someone struggling to remember something, or a stroke, accompanied by chest clutching, usually used when the person using the expression gets a surprising or shocking text message. The length of the HNNNNNG depends on the severity of the action for example, a "HNNG" would be less dramatic than a "HNNNNNNNNNG"
Text message conversation:

Guy1: "Guy2, Girl1 is pregnant!"

by Marneus February 21, 2010
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