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1.
This term means someone is so simple minded that they can't figure out the simplest problems. Their minds are like great big empty voids of any kind of logical thought. This is why even though the can see the trees their simple minds can't grasp that's the forest.
Ray : Did you see that guy trying to change his flat tire, it took him an at least an hour.

Tony :That guy can't see the forest through the trees.
by TV CAR March 29, 2010