a figure of speech to illustrate when a person takes one viewpoint with one audience, but will take the opposite viewpoint with another in efforts to be liked or create harmony.
-That politician is petting both sides of the cat.

-When your Mom shares Pro-Trump Facebook posts, but at dinner claims to believe he's a racist you would be correct to say: "Mom, you are petting both sides of the cat."
by Jeff Pants October 4, 2016
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A friend one makes on social media (such as instagram) through introduction by a mural close friend. Friendships with side cats can develop rather quickly as they have already been vouched for by the close mutual friend so awkward 'I don't know if you're cool or a freaking weirdo' phase can be avoided
So what's with you and Jessica?

Ohh she's one of my new side cats. Jenny introduced us, they went to college together.
by SideCat27 June 12, 2017
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