Meaning of hún dàn:
hún dàn
混蛋
Noun
scoundrel; bastard; hoodlum; wretch
Tā zhège húndàn zǒng shì rě máfan.
他这个混蛋总是惹麻烦。
This scoundrel is always causing trouble.
Tā zhēn shì gè hùndàn, jìngrán bù bāng wǒ.
他真是个混蛋,竟然不帮我。
He is really a bastard for not helping me.
Tā zhēn shì gè hún dàn.
他真是个混蛋。
He is really a hoodlum.
Tā zhēn shì gè hùndàn, zǒng shì ràng rén xīnfán.
他真是个混蛋,总是让人心烦。
He is such a wretch, always making people upset.