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.

plural of grease-monkey