Handler has different meanings in many contexts- in competitive sports it means a trainer, in programming it specifies a routine that deals with a specific situation or type of data, in the CIA, FBI, etc. it means an agent's manager, and in the airport- a baggage handler... puts your bags on a little conveyor belt.
Generically, it means a person or thing which deals with a specific subdomain of interest.
Authoring an Urban Dictionary post makes me a kind of modern definition handler, a weapon of mass education- ya dig?
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