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1.
A person who solves problems - usually with brilliant, lucid thinking under pressure and stylish charisma for galvanizing other people into action.

The phrase comes from the film Pulp Fiction, and can now be used for any seriously efficient professional fixer.
Jules, Vincent and Jimmy didn't know what to do about Marvin until Winston Wolf turned up.

"I'm Winston Wolf. I solve problems."
by Lior Bar-On September 10, 2007