YOU SAID:
You better check yourself before you Shrek yourself
INTO JAPANESE
自分をシュレックする前に自分をチェックしたほうがよい
BACK INTO ENGLISH
You had better check yourself before shreking yourself
INTO JAPANESE
あなたは自分自身をシュレックする前に自分自身をチェックしたほうがいいです
BACK INTO ENGLISH
You had better check yourself before shreking yourself
That didn't even make that much sense in English.