YOU SAID:
Hi guys I'm back in black
INTO JAPANESE
こんにちはみんな私は黒に戻る
BACK INTO ENGLISH
Hi guys I go black
INTO JAPANESE
こんにちはみんな私行く黒
BACK INTO ENGLISH
Hi guys I'm going black
INTO JAPANESE
こんにちはみんな私はつもり黒
BACK INTO ENGLISH
Hi guys I'm going black
That didn't even make that much sense in English.