goose grease

noun3

1. •
   Fat derived from geese.
2. •
   (old-fashioned) An emollient, ointment, liniment, or lubricant containing or resembling such fat.

   • “Barby ought to be well rubbed with goose grease,” mother said, and she looked hard at Jimmy. Jimmy didn’t like to be rubbed with goose grease, so he felt sorry for Barby. — 1927
3. •
   (informal) Smooth talk, fast-talking, flattery.

   • “I’m a big girl, Kip. I don’t–” “Yeah, that’s what I’m afraid of. Just don’t forget he’s got a line as smooth as goose grease.” — 1987