Meme

A meme is an inside joke between you and the internet at large. Understanding it depends on real-time shared information that primarily happens online. This is why it's impossible to explain memes to people who did not grow up with regular internet use.

What's a meme? I don't get it.

Well...

paramour

In polyamorous relationships, your paramour is your primary relationship.

That's my paramour, David. We're married. Susan over there is my girlfriend.