Lyric discussion by losttango 

So the song appears to be drawing a parallel between the extinction of the dinosaurs by the Chicxulub meteor and the potential extinction of humans by nuclear war (the "two big silver trees" being nuclear missiles). "Open the door, get on the floor" is a reference to the old civil defence advice to 'duck and cover' I think.

The earlier verses set up the narrator and his lady friend as living in a naive state of nature, like the dinosaurs or (anachronistically) cavemen. The final "kill the dinosaur" verse could be a plea for disarmament or it could be an ironic cheerleading of destruction.

Don't ask me what the Elvis verse is about though :-) Maybe "roasting blue pork" suggests eating a policeman post-apocalypse because there's no other food?

Compare & contrast with Captain Beefheart's "Smithsonian Institute Blues".

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