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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?
(Trafficker)
Her Handler told her where to show up next.
Handler by Aisha got May 20, 2019
the handler hucked the frisbee. Disappointed that the cutter couldn't get there in time, he yelled, "LAY OUT!!!"
Handler by yeil June 2, 2008
Party responsible for tending to the emotional and physical-sexual needs of a woman.
Q: "Are you gonna for her?"

A: "Dude, she's got a handler."
Handler by C_3K January 17, 2009
A guardian responsible for escorting a retarded child or adult in public. Highly alert and well trained, these individuals can sense when their "client" is ready to change from sweet and calm to loud and destructive. Sometimes seen armed with a chair and a whip as tools for establishing control, particularly with emotional downies.
Warren broke free of his handler and began screaming and throwing trays around the restaurant.
handler by Mike P Kelly February 25, 2007
A service in the open market of taking care of one needs.
I hired a HANDLER with the power company to deal with that, but it wasn't cheap.