grease up verb2 •To smear or otherwise lubricate with oil or grease; especially, to grease (something, such as a machine or a baking pan) thoroughly.On the evening of our second day Mr. Bliss said he thought we ought to grease up our shoes a little so that they would turn water better. — 1898 •(slang) To flatter (someone) excessively; to suck up. formsgreased up · greasing up · greases up