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Verb: Refers to the actions of a group of skiers that existed beginning in the late 1970's until the early 1990's and were avid backcountry and extreme skiers who ventured into out of bounds ski terrain in search of powder.

The best known group of hairbag'r(s) skied the upper elevations of North West Colorado and explored areas above timberline on extremely steep slopes prone to avalanches.
We're going hairbag'n today so be sure to bring your avalanche beacon, rescue shovel and avy probe.
by The Snow Prophet May 11, 2010