Rude, unpleasant people who treat others badly; also the opening at the end of your digestive system.
Compound of 'ass' (donkey or buttocks) and 'hole' (opening). The insult meaning developed in the mid-20th century, building on earlier crude terminology for both body parts and foolish people.
This word is a perfect example of how English lets people combine simple words to create powerful insults—the crude directness actually makes it funny in a way that more 'proper' insults aren't!
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