Grease which contains remnants of other materials (e.g. particles of food, metals, chemicals, dirt, etc.).

Any insulating grease that prevents corrosion of electrical connectors (and spark plugs etc) by preventing access by water

A levered device for forcing grease into machinery. / (colloquial, due to its appearance) A small machine gun, particularly the .45 calibre M3 used by the US in WW2.

plural of grease gun

Lanolin.

(idiomatic, slang) A mechanic, often with the specific connotation of an automobile mechanic.

Something incredibly fast (now mainly used in comparison: like or faster than greased lightning).

A narrow pit or trench over which a vehicle can be driven and conveniently worked on from beneath.

plural of thermal grease

A viscous fluid substance, originally with properties akin to grease, which increases the thermal conductivity of a thermal interface by filling microscopic air-gaps present due to the imperfectly flat and smooth surfaces of the components.