This is when a formal and well-bred character uses a combination of formal speech patterns and mastery of vocabulary to sneak in insults or one liners in a skillful and deadly manner.
Capt. von Trapp in Sound of Music: "You flatter me captain""How clumsy, I meant to accuse you"
Simon Tam in Firefly, especially Objects in Space.
"I can't keep track of her when she's not incorporally possesing a spaceship, don't look at me"
And in Safe,"I'm sorry dad, I would never have tried to save River's life if I had known there was a dinner party at risk."
Higgins often does this to Magnum in Magnum PI. He can't do it as well as some.
Churchill, of course.
Several noted English intellectuals, including Chesterton, Orwell, and others.
Field Marshal Mannerheim. He could intimidate Hitler himself, possibly because of his Death Glare