Am I beautiful yet?

Canon is basically things that are real in the regular world, are real in the world of whatever you are talking about. This is generally done through something being mentioned, shown, or hinted at. RD names her pet Tank, and in the song she says "Faster than a bullet". Because tank and bullet where mentioned, you could say war/weapons are canon. Like the guys below us said, there is that one guy in the song from the leaked episode who likes giant tubs of jelly. You can say that fetishes are now canon as well. That help?

It doesn't have to be real in the regular world, just confirmed within the show (in the case of MLP)
i.e. Pegasi being able to move clouds in canon.

I forgot to mention that, thanks bro.

Yes! Thank you very much. Please take this gif in return, it's the only pony one I have for you.

No problem. You're a new brony I'm guessing?

Kind of. I've been watching the show for a few months now, but only recently have I embraced my bronyness and declared it a part of my life.

Have another "Join the herd" gif

STRANGELY OBSESSED WITH GIANT TUBS OF JELLY :D