The ailment one suffers on March 18th after properlyly celebrating St. Patrick's Day. Anyone of Irish descent may also use the term to denote a hangover on any day of the year.
Seamus: Ugh, I was out drinking Guinness until the wee hours. I think I'll call in with the Irish Flu today.
The tendency of Irish men to be endowed like potatoes: shorter than average and very thick.
You should have seen Seamus with his pants down! The potato curse hit him hard!
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