A fork of Rural Dictionary
To slit someone's throat by swinging your knife/shank/etc. is a arc that mirrors a smile and buryinng the knife into the victim's throat.
"I got business to attend to-I've got smiles to cut." Bellowed Iggy.
"You like a smile?" Candy said quietly.
And then her hand swung up in a silvered arc and she buried the knife in his throat.