A lube job is a carry over term from many many years ago when it was necessary to grease several fittings under the car related to suspension and steering. It is uncommon today for any of those same parts to need grease anymore. They are built with materials that tend to be self lubricating, packed with much superior grease, and what grease there is much better sealed into the component.
Today, the term "lube" usually means nothing more than checking and topping of fluids when it is performed along with an oil change.
