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when one suffers symptoms of the flu(headache, stomach ache, etc.) but in reality it's not that at all, but rather a hang-over, morning sickness, food poisoning.
Susan: Wow, what was wrong with you last night. You sounded funky.
Lucy: Oh... I was feeling funky. Just a little head/stomach thing... not the flu... just "the fluke."
by Pony Up January 26, 2008