Irish Flu 

A particularly unpleasant hangover.

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

Irish Flu by Melissa July 10, 2004

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

Irish flu by Lee Charles Kelley April 6, 2005

Irish Flu 

An unpleasant hangover (From the movie "The Shallows"

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

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.

Irish Flu by robbie vienna March 18, 2009

Irish Flute 

The act of swallowing semen, followed by a shot of Irish whiskey.

Every St. Patrick's Day, Ann anticipates the tradition of partaking in an Irish Flute.

Irish Flute by jimbarb January 17, 2010

Irish Flute 

The act of an irishman farting into a woman's vagina.

When my boyfriend proposed to me I was so excited we went back to the hotel to play the Irish Flute.

Irish Flute by Bert Stiensteiner March 30, 2009

Irish Skin Flute 

After a long night of partying,A man gets a blowjob, then the man starts to puke off to the side, and the girl keeps on going.

Dude- I was at this party once, Billy got an Irish Skin Flute on the front porch...
Billy- and i didn't even get her name.

Irish Skin Flute by "The Dude"08 February 23, 2009