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1. The act of discrediting a political opponent, regardless of military service record, by making truthful, searing claims about his/her character and past actions. 2. Battering by a shallow-draft, flat-bottomed boat with three bench seats. Origins: The capitalized J distinguishes this from the jon boat (n.) and is a reference to both Jonathan Swift and Jon Stewart (born Jonathan Stuart Leibowitz), but not John Kerry, as he spells his John with an 'h'. See, also, swiftboat and jon boat.
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