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3.
To leave a social event drunk without any recollection of when or how.
Dude 1: Dude, I don't even know what time I left the wedding. Man was I trashed.
Dude 2: Yeah man, nice Irish exit, nobody knew you even left.
by NYCityBoy July 20, 2006
 
1.
More specifically, the irish exit refers to the departure from any event without telling any friends, associates or acquaintances that one is leaving. It is almost always the result of being very inebriated/intoxicated.
Man 1. Hey man, where'd you go last night? You just disappeared, did you take a girl home or something?

Man 2. Nah, I got drunk and pulled an irish exit. Uh... happy birthday by the way.
by moncho November 27, 2007
 
2.
“Irish Exit” is a term used when a person leaves a place without saying goodbye to the people they are with.

Irish Exit is to leaving without saying goodbye: as Slim is to a nickname for an overweight person.

Early versions of the term Irish Exit come from Irish Americans leaving social functions like Church, football games, and plays. When the functions let out people would congregate outside and chat with each person they knew and say goodbye before heading home. This usually added 30 minuets to an hour to the evening. When there was little or no time to do the customary goodbye, the family would leave through the side door. The side door move became known as the Irish Exit. The term has come to mean leaving a place without saying goodbye to those you are with or those you came with.
Joe-"Where is Timmy?"
Pat-"He pulled an Irish Exit about an hour ago!"
by P.Seal September 26, 2011
 
4.
A drunk person's poopsack/ poophole.
Creeper: You get any from that drunk girl last night
Other Creeper: Yeah she let me stick it in her irish exit.
by OrdinaryFreak101 June 22, 2011