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1.
In Ireland, somebody from Dublin.
by Keith Gaughan July 24, 2003
 
2.
DEROGATORY TERM FOR SOMEONE FROM DUBLIN
DERIVED FROM DUBLIN STRONG ASSOCIATION WITH BRITIAN AND BRITISH INFLUENCE ON THE CITY. WHEN THE QUEEN VISITED DUBLIN THE PEOPLE WAVED UNION JACKS TO WELCOME HER WHICH LED TO THEM BEING REFERRED TO AS JACKEENS
by Niall Byrne September 08, 2008
 
3.
Used to describe someone from Dublin, typically used by muck savages from Cork with their grating, whining accents.
"Anto is a fuckin' jackeen bai."
by YOREMA August 15, 2003
 
4.
A person from Dublin (derogatory)

Given as how Dubliner sloved the queen some much and used waived the Union Flag when Victoria visited they are known by the rest of us true Irish people as Jackeens
If it was a bag of heroin you'd catch it ya jackeen scumbag ya
by Thomas Van Der Westhaven April 28, 2005
 
5.
A slightly pejorative name for a person from Dublin. Commonly it is shortened simply to Jack, and Dubliners often refer to themselves as such. The opposite of a Jackeen is a Culchie.
James Joyce-Jackeen(as he was born in Dublin)
Michael Collins-Culchie(is from co. Cork)
by Emmaergo May 29, 2008