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(n.) The predictably jagged top half of a recently broken glass bottle held at the neck by the wielder.
Mickey called Paddy's sister a whore from Revere so Lenny grabbed a bottle of Jameson; made an 'Irish knife' on the bar; and held it under Mickey's nose and made him apologize. Then they all made their peace and went out to beat up some smart kids from Harvard.
by Pauly M October 31, 2006
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