Irish Flu

A particularly unpleasant hangover.

"Last night was great, but I have the worst case of the irish flu today."

by Melissa July 10, 2004

Irish Flu

An unpleasant hangover (From the movie "The Shallows"

" ...and now she's just stuck back at Las Rocas with the Irish flu"

by Mr Moor January 21, 2018

Irish Flu

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.

by robbie vienna March 18, 2009

Irish flu

A hangover, usually involving whiskey; may be mild or severe

"I’ve still got a touch of the Irish flu."

"The Irish flu?"

"Also known as a hangover."

(from "A Nose for Murder" by Lee Charles Kelley

by Lee Charles Kelley April 6, 2005