出典:Wiktionary
Uncertain: Possibly, swift + boat, or possibly based on an acronym for Shallow Water Inshore Fast Tactical Craft.
The use as a political term derives from a smear campaign against John Kerry when Texas tycoon Robert J. Perry hired several Navy swiftboat veterans to form the group Swift Boat Veterans for Truth, which questioned the legitimacy of Kerry's status as a war hero.
swiftboat (複数形 swiftboats)
swiftboat (三人称単数 現在形 swiftboats, 現在分詞 swiftboating, 過去形および過去分詞形 swiftboated)