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Scare quotes are "quotes" put around a "proposition" because it is "unreliable". They are the written equivalent of air quotes.
 In writing
Legitimate quotation marks are used when you wish to quote, or state without endorsing, the words of another:
This is classic quantum woo and a legitimate use of quotation marks.
Scare quotes, by contrast, accurately represent a correct statement in such a way as to imply it is held only by the one or a few people, for example:
when describing a study that produced highly credible, respected, widely reported, rigorous and unambiguously negative result for homeopathy.
In general, scare quotes are among the cheapest of cheap rhetorical tactics, and used in excess they tend to detract from a text's credibility by suggesting that the writer is unable to resort to more substantial maneuvers.
The term is also used to refer to the now-common misuse of quotation marks by people who think their purpose is for emphasis rather than, you know, quoting.
 The gesture
Air quotes can also convey a sense of irony. Air quotes first appeared in the 1920s and became popularized as a comedy device in the 1970s-1980s, particularly by Steve Martin and Chevy Chase.
Beginning with the Trump presidency, it has been noticed that both Trump and his press secretary, Sean Spicer, have been using scare/air quotes in reference to things that they themselves have said, as an apparent lame attempt at plausible deniability. E.g., the plausible deniability was attempted on this quote:
“”Terrible! Just found out that Obama had my "wires tapped" in Trump Tower just before the victory. Nothing found. This is McCarthyism!
So, "President" Trump didn't really "mean" "wire tapped" because he put the words in "quotes", according to "Press Secretary" Spicer. Trump had likely been libeling President Barack Obama by accusing him without evidence of a felony (unauthorized wiretapping) that is most unlikely that he committed. It is also likely an impeachable offense for Trump, falling under the category "serious misconduct by the government official", and the reference to the quotes by Spicer was a desperate attempt to backpedal.
 SNL's video explanation
- ↑ 1.0 1.1 1.2 1.3 1.4 An investigation of air quotes, mostly used to discredit the other side's words, not your own, as per Sean Spicer by Derek Hawkins (March 14 at 5:56 AM) The Washington Post.
- ↑ Spy Magazine (March 1989) The "Isn't it Ironic" issue.
- ↑ Donald Trump's wiretap tweets raise his risk of impeachment by Noah Feldman (March 6, 2017) Chicago Tribune.