tree bashing
n. Skiers‘ slang for skiing in the trees that divide the slopes on a mountain. Also: tree-bashing.

Example Citations:
The term tree bashing is a bit of a dark joke, a reminder of just how dangerous a thing it is to do.
—Rick Reilly, "Slippery Slopes," Sports Illustrated, January 19, 1998

For more years than I care to remember, poltergeist-like twinges have haunted my right knee, courtesy of a large defensive tackle from Youngstown State. Then last November I made the mistake of following my snowboarder son tree-bashing in the powder. I flopped over, felt a little stabbing pain, levered myself up, and kept skiing.
—Fred Matheny, “Tales from the crip,“ Bicycling, September 1, 1995

Earliest Citation:
Common sense ought to keep skiers from "tree bashing," the practice of heading off the course for a game of dodging trees, but some daredevils do it anyway.
—Edward M. Eveld, "Injuries are no way to spend vacation," The Kansas City Star, November 13, 1994

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