noun

• (informal) A very rapidly moving object, especially one that is thrown.
  "The pitcher threw a real zinger and struck him out."
• (informal) A surprising or unusually pointed, humorous and impressive insult or insulting quip.
  "I wasn't looking to make friends; there had been too much animosity between us in the past, and maybe the guy had a zinger waiting on me."
• (informal) An event that when experienced leaves the witness dazed, either physically or metaphorically.
  "I was still reeling from the zinger of seeing my ex on a date with my best friend."
• (informal) An outstanding, energetic and surprising thing or person.
  "They'd have to come up with a zinger for their Christmas windows to compete with that competitor's laughing Santa Claus and Stefan had that zinger in his proposal submitted to the President of the company."