slacklining 

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?

slacklining by Adam Pudliner July 29, 2006

Slacklining 

The act of AWESOMENESS...
Jayrod Waters...
A unique way of life that scares the hell out of most...
Life...

Jayrod Waters IS slacklining.
Slacklining IS Jayrod Waters.

Slacklining by FrogWaters December 22, 2019

Slack Lining 

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.

Slack Lining by Martin Kaan February 13, 2015

blacklining heinies 

To chug a heinekin bottle to the blackline. This is a drinking game becoming popular in Both the US and Canada. The person who is farthest from the blackline loses and typically buys the round or does a shot.

At the bar yesterday everyone got wasted blacklining heinies.

blacklining heinies by dbm7 October 18, 2008

Slacklinning 

To urinate through the for-skin and not having the courtesy to 'cock-back' and revel the helmet for increased aim. Usually ending in a large amount of spray in all directions.

Dude, which one of you cucks was slacklinning!! There's piss all over the floor!

Slacklinning by Keith William October 17, 2016