An archaic or dialectal term for a foolish or simple-minded person; a term of contempt or mockery.
Origin uncertain; possibly related to 'gump' (a foolish person) or from a dialectal English word. The suffix '-eon' or '-ion' is common in older English insult words and proper names.
This is a wonderfully obscure insult from English history—'gumpheon' captures an era when people had elaborate, creative ways to call each other foolish, before modern slang replaced them.
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