under the hood: adj. [hot-rodder talk] 1. Used to introduce the
underlying implementation of a product (hardware, software, or
idea). Implies that the implementation is not intuitively obvious
from the appearance, but the speaker is about to enable the listener
to grok it. "Let's now look under the hood to see how ...." 2.
Can also imply that the implementation is much simpler than the
appearance would indicate: "Under the hood, we are just fork/execing
the shell." 3. Inside a chassis, as in "Under the hood, this baby
has a 40MHz 68030!"