Final answer:
Nick is describing a chaotic and surreal scene in which certain phrases lose their meaning.
Step-by-step explanation:
In this passage, Nick is describing a chaotic and surreal scene in which certain phrases have become so overused that they lose their meaning. The phrase 'turbaned character leaking sawdust at every pore as he pursued a tiger through the Bois de Boulogne' is an example of how these worn-out phrases no longer evoke any vivid image in the reader's mind.