This page deals with slang terms for a Zombie apocalypse, in the heat of the moment it's easy to garble in horror at the situation and important messages are lost so easy terms are introduced by the military which are inevitably adopted and mutated by civilians.
In art, an underpainting is an initial layer of paint applied to a ground, which serves as a base for subsequent layers of paint. Underpaintings are often monochromatic and help to define colour values for later painting.
Underpaid due to the fact that we are working with dangerous machinery and are doing a lot of heavy lifting. The company makes a very good profit off what they do so they should be able to pay their employees a little more than what they do.