Past tense of gammon; deceived or tricked someone with false talk, or treated something as if it were gammon meat.
From gammon (to deceive or the meat), expressing an action completed in the past with the -ed suffix.
If someone 'gammoned' you, they fed you nonsense the way you'd eat a slice of ham—the metaphor shows how language lets us taste deception, making abstract lies feel very real and nourishing.
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