zinger

[zing-er]
noun Informal.
1.
a quick, witty, or pointed remark or retort: During the debate she made a couple of zingers that deflated the opposition.
2.
a surprise, shock, or piece of electrifying news: The president's resignation was a real zinger.
3.
a person or thing that has vitality or animation or produces startling results.

Origin:
1950–55; zing + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
zinger

noun
a striking or amusing or caustic remark; "he always greeted me with a new zinger"; "she tried to think of some killer of an argument, a real zinger that would disarm all opposition" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
It's not much of a zinger, but the crowd claps and laughs.
But you have to admit, that was a pretty good zinger.
He'd ask a reverent question, she'd laser him a suspicious look, waiting for
  the zinger.
Some presenters say they dread asking for queries at the end of a meeting,
  worried that a zinger is in the wings.
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