"Oirish" is a term coined by amused Irish natives to describe anything associated with the tourist cult of Ireland that paints it as the land of shamrocks, blarney stones, leprechauns, and Guinness.

It can also be used to describe anyone who despite many generations in the new world and questionable Irish ancestry constantly proclaims themselves to be Irish. This can range from an innocent baseball cap with a shamrock on it to a drunken twit in a kilt idiotically greeting everyone with a faux accented "top o' the mornin' to yah laddie".
Phill : Oh look it's J. do you see that the twit brought himself a shillelagh.

Robert : Yeah I see. It's great little costume he has there you'd almost think the oirish twit was auditioning for a part on Ballykissangel.

American Tourist : Put a Shamrock in Me Guinness.

Bartender : ::Tosser::
by Darker March 15, 2011
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a funny made up way of speaking that english cunts and americans seem to think irish people talk
ah to be sure to be sure, tis a beautiful diddly i day

top o' the mornin to ye laddy
by Patrick [ ToXikfb ] January 9, 2005
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fake irish, plastic paddy
good way of describing Irish Americans
never been there, never will go there
by bigmeuprudeboy September 10, 2003
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