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To pull down the wider part of somebody's tie to create a stiff knot at the top which is almost impossible to undo. Most commonly used as a prank in British schools where ties (long narrow piece of fabric tied worn around the neck and tied with a loose-ish knot) are usually part of the uniform.
Random Student: Got tiejacked 5 times today. Now I can't get my tie off.
by Luna lovegood December 16, 2014
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