YOU SAID:
Hello Im a big fat kitty cat
INTO JAPANESE
こんにちは、私は大きな脂肪キティの猫
BACK INTO ENGLISH
Hello, I am a big fat kitty cat
INTO JAPANESE
こんにちは、私は大きな脂肪のキティの猫です
BACK INTO ENGLISH
Hello, I am a big fat kitty cat
That didn't even make that much sense in English.