zinger

1. (informal) A very rapidly moving object, especially one that is thrown.Examples: "The pitcher threw a real zinger and struck him out."; "On the first pitch from Kline, Lofton hits a zinger of a single into right field that J.D. Drew picks up on one bounce, and if he makes a good throw he has a chance to throw David Bell out at home plate."CanadaUSinformal

2. (informal) A surprising or unusually pointed, humorous and impressive insult or insulting quip.Examples: "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."; "You might think it's almost worthwhile calling them and restarting the argument just to get that final zinger in. Why do you think of something good to say when it's too late?"; "Boris Johnson is the most compelling personality in “Chums.” The shambolic style, the self-deprecating humor, the gift for zingers—it was all there in university, as was the elitist’s ambivalent approach to achievement."Synonyms: one-linerCanadaUSinformal

3. (informal) An event that when experienced leaves the witness dazed, either physically or metaphorically.Examples: "I was still reeling from the zinger of seeing my ex on a date with my best friend."CanadaUSinformal

4. (informal) An outstanding, energetic and surprising thing or person.Examples: "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."; "Think about all the scientists—and all the microscopes and lab equipment and testing—that may come up with zero instead of a zinger."CanadaUSinformal