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1.
An environmentalist who spikes trees to keep them from being logged.
The treemugger went out into the woods with his spikes and hammer. No one was going to log this forest.
by writnstuff January 25, 2010
 
2.
The opposite of a Tree Hugger; One who hates the environment, litters, does not recycle, does not believe in Climate Change or Global Warming, ect.
Jimmy is such a Tree Mugger! He Leaves his Hot Cheetos bags all over the ground!
by K-Song April 13, 2011