YOU SAID:

when you accidentally pee on the toilet seat instead of your girlfriends face

INTO JAPANESE

あなたが彼女の顔の代わりに誤って便座をおしっこしたとき

BACK INTO ENGLISH

When you accidentally pee the toilet seat instead of her face

INTO JAPANESE

彼女の顔の代わりに誤って便座をおしっこしたとき

BACK INTO ENGLISH

When I accidentally peeed the toilet seat instead of her face

INTO JAPANESE

彼女の顔ではなく誤って便座をおしっこしたとき

BACK INTO ENGLISH

When I accidentally peeed the toilet seat instead of her face