cumperEtymologyFrom Tony Cumper, imposter who apparently named himself after Captain William John Cumper MC, a founding member of the SAS.cumper means A man who concocts or massively exaggerates a military service record for himself, usually claiming membership of the special forces. Lexicurio rates it Rare gem — a strength score of 80 out of 100.nounA man who concocts or massively exaggerates a military service record for himself, usually claiming membership of the special forces.