The act of having an unbelievable amount of fun walking and doing tricks on a piece of one inch climbing webbing pulled tight between two points, also used as a form of meditation, physical and mental training.
See also: Slack
Hey Jim want to go slacklining?
by Adam Pudliner July 29, 2006

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Top Definition
A business maneuver in which an employee continually sends insubordinate emails to his/her boss with the intent of embarrassment and or emasculation. Similar to the outdoor practice of slack lining it can be risky and carry with it the complete destruction of one's career.
John was really slack lining when he sent his boss an email with all the ways he had misinterpreted the sales data, luckily he copied the CEO on the email and his boss was later fired.
by Martin Kaan February 13, 2015

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