Thinking about it, thinking about it, thinking about it ... and still not caring. Why, because I have no fears of what they might find. Do no wrong, and you don’t need to worry about prying eyes. “But the principle ...”

The term comes from plumbing. An air gap in plumbing is a literal break in a piping line, where a pipe ends above a cup or sink which then connects to underslab drain lines. It prevents a drain from “backing up” into the clean piping. Having a non-connected computer is analogous.