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The act of dyeing your pubes flaming red, getting belligerently drunk, and having sexual intercourse standing up. Immediately before climaxing, you pull out your member, kick the girl's legs out from under her, yell, "TIMBER!!!" as she falls to the ground, and finish what you've started on top of her.
Mark: "Last night, I was at this St. Patrick's Day party and I totally gave that chick an Irish lumberjack!"

John: "The only bad thing about an Irish lumberjack is the four months it takes for your flaming bush to grow out."
by LuckytheLeprechaun April 25, 2010
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