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the congestion and fatigue you feel the day after you've suffered hayfever. i.e you technically aren't as bad as the day before, but you still aren't 100% either.
non-hayfever sufferer - "come on! you had hayfever yesterday you should be over it. lets go out!"

hayfever sufferer - "no thanks, i still have a killer hayover"
by MayaS April 09, 2008
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