Being severely pissed off.
Please don't get my Irish up.
by Saints February 23, 2005
To cause them to go into a blinding, seething, often-homicidal rage. See also: Infuriate.
Get someone's Irish up: "This mother-fucker is gonna get my Irish up if he doesn't get out of my way!"
by voodooKobra July 07, 2007