ANSWERS: 1
  • It's just general slang that started up sometime during the 20th century. While nobody knows for sure how it came about, it's believed that a rat was used in the expression because of the way people view the rodent (annoying and small). From the net.
    • Roaring
      Yes. Take anything that has no or negative value and here it is: "A rats ass" Although if I were a rat, that ass might very well be appealing.

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