Side cat

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.