Top Definition
The flu-like symtoms experienced on a Wednesday when the effects of a heavy weekend chemically react with the hard slog of work
Pauline: I feel horrendous today, sore throat, bloked nose, headache, tired....
Colin: Did you go out at the weekend?
Pauline: Yes and then some...
Colin: Hmmm looks like a bad case of influednesday to me.
by Squapstars October 19, 2011
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