Top Definition
The act of calling in sick to work after a night of getting royaly shit-faced hence the Irish Sick Day aka the Irish vacation day.
I know Tony was fucked up at the club last night he must be pulling the old Irish sick day.
by Mark McNamara March 18, 2006
March 18
Greg - "wake up man you gotta go to work"
Bryce - "nah man I can't it's Irish Sick Day"
by Crap Factory November 18, 2008

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