dumdum

/ˈdʌmˌdʌm/
noun
  1. A type of bullet that expands upon impact, causing a larger wound.
    • Dumdum bullets are banned in many international conflicts because of their severity.
    • The soldier was wounded by a dumdum bullet during the battle.
    • Hunters sometimes use dumdum ammunition for certain types of game.
  2. A stupid or foolish person (informal, sometimes used playfully).
    • My little brother can be a real dumdum when he's tired.
    • Don't be such a dumdum—you left your keys in the door again.
    • He called me a dumdum for forgetting the meeting time.
Antonyms
What does "dumdum" mean? | whatsthatwordmean | whatsthatwordmean