The origin of "get off your ass"?**

Indeed, I think it would be tantamount to an astonishing revival of religion if the people would all walk to church on Sunday and walk home again. Think how the stones would preach to them by the wayside; how their benumbed minds would warm up beneath the friction of the gravel; how their vain and foolish thoughts, their desponding thoughts, their besetting demons of one kind and another, would drop behind them, unable to keep up or to endure the fresh air! They would walk away from their ennui, their worldly cares, their uncharitableness, their pride of dress; for these devils always want to ride, while the simple virtues are never so happy as when on foot. Let us walk by all means; but if we will ride, get an ass.

- John Burroughs, "Winter Sunshine" (1875)

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** Ass, dopey, I said ass.
:)