The quality of being chunky, lumpy, or of containing chump-like pieces; poor quality or awkwardness.
From 'chump' plus '-iness' suffix. 'Chump' itself may derive from 'chunk' (a thick lump), and '-iness' creates an abstract noun describing the quality of being chump-like or chunky.
You can feel 'chumpiness' in your mouth when you're eating bad porridge—the word literally describes the texture of lumps, which is why it evolved to mean something is of poor quality.
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