tree-killer definition, from Internet Connection, Inc.

[Sun]

1. A printer.

2. A person who wastes paper. This epithet should be interpreted in a broad sense; ‘wasting paper’ includes the production of spiffy but content-free documents. Thus, most suits are tree-killers.

It is likely that both senses derive their flavor from the epithet ‘tree-killer’ applied by Treebeard the Ent to the Orcs in J.R.R. Tolkien's Lord of the Rings. See also elvish, elder days, and especially dead-tree version.