Grease may refer to: Common uses. Grease (lubricant), a type of industrial lubricant. Grease, any petroleum or fat (including cooking fat) that is a soft solid at room temperature. Brown grease, waste vegetable oil, animal fat, grease, etc. that is recovered from a grease trap. Yellow grease, in rendering, used frying oils, or lower-quality grades of tallow. Hydrogenated vegetable oil, used as a replacement for lard and other rendered animal fats. Vegetable shortening, used as a replacement for lard and other rendered animal fats. Slang.
https://en.wikipedia.org/wiki/Grease