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1. Tool
One who lacks the mental capacity to know he is being used.
A fool.
A cretin.
Characterized by low intelligence and/or self-esteem.
2. Tool
Almost synonymous to douche bag; the type of person that likes to show off their physique in public;…laughs at their own non-hilarious jokes; under the false assumption that they are perfect; whines like a spoiled 5-year-old when something doesn't go their way.
http://www.urbandictionary.com/define.php?term=tool