The act of masturbating in the wilderness, or timber.
Guy: The squirrels weren't moving the other day so I decided to pass the time with a timberjack. Cleaned up with an oak leaf.
by CharleyBroccoli October 19, 2010
1 more definition
Mascot for the most badass high school in Northern California.
Man, we got out ass kicked my the timberjacks on Friday night.
by ryanocar May 12, 2008