YOU SAID:
Your daddy ain't comin' back with the milk 'cause he caught mommy sleeping with the milkman while the mailman watched.
INTO JAPANESE
あなたのお父さんは、郵便配達員が見ている間、ミルクマンと一緒に寝ているママを捕まえたので、ミルクを持って戻ってきませんでした。
BACK INTO ENGLISH
Your dad didn't come back with milk because he caught a mom sleeping with Milkman while the mail carrier was watching.
INTO JAPANESE
あなたのお父さんは、郵便配達員が見ている間にミルクマンと一緒に寝ているお母さんを捕まえたので、ミルクを持って戻ってきませんでした。
BACK INTO ENGLISH
Your dad didn't come back with milk because he caught a mom sleeping with Milkman while the mail carrier was watching.
That didn't even make that much sense in English.