The eggdrop cuts off the definition where there is another urban-dictionary word that links to that definition.
[1:22:43 am] <LanEvo> .ud tool
[1:22:44 am] <Eggdrop> tool: One who lacks the mental capacity to know he is being used. A
The full definition according to the website is:
One who lacks the mental capacity to know he is being used. A fool. A cretin. Characterized by low intelligence and/or self-steem.