law-enforcement officer/agent
walloper
noun
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penis; (by extension) an idiot, a stupid person.
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One who wallops.
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A policeman, a male police officer.
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Something big; a whopper.
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A cudgel, a shillelagh.
How often have the words law-enforcement officer/agent and walloper occurred in a corpus of books? (source: Google Ngram Viewer )