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@Z_P:
HUD = Heads Up Display, a semi-transparent overlay over your normal visual field, currently used by military pilots, but a frequent SF construct too.
Grepping = verbification of Unix grep command for searching text for regular expressions.
I think the others in your list are more specific to "Down and Out..."; as I remember they may be explained later. A lot of the context may remain mysterious if you haven't been to DisneyLand/World, but the main plot is still amusing.
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