YOU SAID:
hello what are u doing
INTO JAPANESE
こんにちはあなたは何をしています
BACK INTO ENGLISH
Hi what are you doing?
INTO JAPANESE
なにをしているの?
BACK INTO ENGLISH
What are you doing, man?
INTO JAPANESE
なにをしているの?
BACK INTO ENGLISH
What are you doing, man?
That didn't even make that much sense in English.