Present participle of chump: fooling or tricking someone, or chewing and crushing noisily.
From 'chump' with the '-ing' suffix. Describes either the action of tricking someone, or the action of chewing heavily and noisily—both meanings derive from different senses of 'chump.'
The same word 'chumping' can mean 'chewing loudly' or 'tricking someone'—English lets totally different meanings hide in the same word, like a linguistic pun.
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