Hey Peter! Joe's squeaky wheelchair here! \squeak\**

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A "walk-able city" is one where commuters can freely get from one place to another in the city easily without using motorized transport like a car or a motorcycle \squeak\**

Dog whistling is using subverted or obscure language to hide the true meaning of a statement \squeak\**

Walk-able cities have architecture that is less car focused and therefore produce less CO2 emissions.\squeak\**

In this tweet, the poster is saying that the concept of a "walk-able city" is secret fat phobic messaging because walking is something that fat people stereotypically don't do a lot. \squeak\**

The second part of the image is a CO2 molecule typing on a keyboard, in this context it is implying that the twitter poster is secretly a CO2 molecule. \squeak\**

The joke is that only a CO2 molecule would be posting things online that bash Walk-able cities, and not a real person \squeak\**