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When someone coughs near you, and you or someone else near, coughs without the real necessity to do so.
On train, random guy out of eyesight coughs.

Girl one coughs.

Girl two says "That was so a sympathy cough."

Girl one says "Yeah, like I don't even have thyroid fever."

Girl two says "I don't even know you."
by The masked avenger of doom December 17, 2010
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