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A gesture with raised pairs of fingers when making a statement, to simulate quotation marks. It indicates that what is being said is ironic or otherwise not to be taken verbatim.
This originated in the USA. In 1989, Spy Magazine included this:
The practice may not have been given a name until the 1980s, but there is a record of its being in use much earlier - in the July 1927 edition of Science:
See also - air kiss.