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A total clueless sack of dirt who still yells at everyone else when they mess up. Basically a walking insult.
My boss is a kaasstengel. He can't do anything right but still blames me for the coffee spill.
That kid failed the test but still called me a kaasstengel for no reason.
My mom is a kaasstengel. She can't cook but still yells at me for burning the toast.