douche boat

noun2

1. •
   (slang, vulgar) A rude, obnoxious, or contemptible person.

   • No one gives a flying fuck what you douche boats write. — 1997
2. •
   (US, slang) A river craft outfitted with a high-pressure water cannon capable of destroying enemy encampments.

   • Douche boats destroyed two bunkers and accumulated 30 minutes of water time. — 2005