You are Twilight Sparkle, the sole princess of Ponyville. Your best friend just so happens to be a monkey from another dimension and oh boy does he teach you a lot! Swearing whenever you stub your hoof; swearing whenever something that could go wrong does go wrong; swearing when... you get the point

But the most important thing he taught you was that swears aren't illegal where he comes from.

Things go straight to shit as soon as you find out.