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1) Cockney rhyming slang for the Flying Squad, an elite fast response dectective branch of London's Metropolitan police. Often contracte to The Sweeny.

2) A mythical and murderous London barber who killed his customers and sold the bodies to a near by pie shop.
"WE've been told to touch nothing until Sweeny Todd get's here."
by black flag June 26, 2004
(verb) To kill somone with a straight razor via the jugular vein.
Im about to go Sweeny Todd on your ass if you ask me again!
by Assassin Phone inc. April 07, 2008