This term is not a slight against the Irish. Rather, it is a term used to describe descendants of Irish immigrants that are outrageously proud to be Irish even though they are about as Irish as I am Martian. They have Irish flag stickers on their car, an Irish flag hanging above their bed and an Irish flag tattooed on their arm above their tribal arm band. This person always talks about their Irish grandparents (that were born in Maryland), constantly talks about the trip they took to Ireland when they were 11 years old and explains that they will move to Ireland "some day." They wear Dropkick Murphy's and Flogging Molly tee shirts, but don't own any of the cd's. They are always gloating about Irish heritage, but this person lacks Irish credentials. Examples include, but are not limited to:
a) neither they or anyone in their family has red hair
b) they have a last name like Richards, Bukowski or Weisburg
c) their skin doesn't explode when exposed to direct sunlight
d) they can't hold their booze
e) the latest relative of theirs that actually came over on a boat from Ireland died 97 years ago at age 53
Zack: Are you going on the pub crawl with us this weekend? Dave's wannabe Irish ass said he's gonna drink us all under the table.
Mike: I'll go as long as O'McFinniganly doesn't walk around wrapped in the Irish flag, fake an Irish accent, and throw up and pass out all shitfaced in the middle of the street after the third bar.
Zack: You know that's exactly what'll happen.
Mike: Let's take pictures this time.