YOU SAID:
your mom is a stinky head
INTO JAPANESE
あなたのお母さんは臭い頭です
BACK INTO ENGLISH
Your mother is a smelly head
INTO JAPANESE
あなたのお母さんは臭いの頭です
BACK INTO ENGLISH
Your mother is smelling head
INTO JAPANESE
あなたのお母さんは頭を嗅ぐ
BACK INTO ENGLISH
Your mother sniffs her head
INTO JAPANESE
あなたの母は彼女の頭を嗅ぐ
BACK INTO ENGLISH
Your mother sniffs her head
That didn't even make that much sense in English.