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1.
1) Refers to the state of your piece (area of land) when planting trees for reforestation purposes. It means that your piece is particularly nasty, brutal and difficult to move through.

2) When the land is covered in massive amounts of cut branches, slash, thorns, stumps and other fallen debris.
"Man it took me so long to finish the back of my piece 'cos it was so shnarby in there."
by 32Dimensions February 17, 2009