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term in which one (typically, but not exclusively, an Irishman) doesn't remember anything about his life except

his grudges and past quarrells.
usually the result of dwelling on negative past experiences instead of family triumphs.

can also be the result of heavy drinking and on-track betting.
"My grandpa has a case of Irish Alzheimers. He can't remember anyone's birthday, but he remembers all the bookies who gave him bad tips at the Meadowlands 20 years ago."
by earth bound misfit June 13, 2007