I will try my best to translate this but I wouldn't say its very good. I will only be able to do half of it since I am at school I will be able to do the other half of it later. I also fixed some errors in the romaji
Oh oh oh oh oh (x3)
[Yuri] kanpeki na bad girl yo/A perfect bad girl
Oh oh oh oh oh (x3)
[Seohyun] kanpeki na bad girl yo/A perfect bad girl
[Tiffany] watashi no secret shitte i ta nara/If you knew my secret
Anata wa sou kitto odorokun janai?
[Sooyoung] donna jidai mo kagayaku my style
Hokano dare ni mo mane deki nai wa
Kono himitsu
[Jessica] oshie te ageru ([Yoona] oshie te ageru)
[Sunny] hora mise te ageru ([Yoona] alright)
[Taeyeon] mou kakugo deki teru ? ([Seohyun] mou kakugo deki teru ?)
[Tiffany] sugu toriko ni naru ([Seohyun] toriko ni naru)
Oh oh oh oh oh (x3)
[Sooyoung] kanpeki na bad girl yo
Oh oh oh oh oh (x3)
[Hyoyeon] kanpeki na bad girl yo
[Jessica] so tell me what you wanna do ?
[Yuri] souzou ijou no feeling machigai nai desho ?
Wata shi dake no rule futsuu ja iya na no
[Sunny] muzukashiku nai wa sunao na dake
Anadora nai de yo tada tsui te ki te
Kono himitsu
[Jessica] oshie te ageru ([Yoona] oshie te ageru)
[Sunny] hora mise te ageru ([Yoona] alright)
[Taeyeon] mou kakugo deki teru ? ([Seohyun] mou kakugo deki teru ?)
[Tiffany] sugu toriko ni naru ([Seohyun] toriko ni naru)
Oh oh oh oh oh (x3)
[Jessica] kanpeki na bad girl yo
Oh oh oh oh oh (x3)
[Sunny] kanpeki na bad girl yo
[Jessica] so tell me what you wanna do ?
[Tiffany] boy what you wanted to do
[Jessica] so tell me what you wanna do ?
Oh what you want to do boy
What you wanna, oh woah
Tell me what you want
[Hyoyeon] wata shi no secret shitte i ta nara
Anata wa sou kitto
[Jessica] oshie te ageru ([Yoona] oshie te ageru)
[Sunny] hora mise te ageru ([Yoona] alright)
[Taeyeon] mou kakugo deki teru ? ([Seohyun] mou kakugo deki teru ?)
[Tiffany] sugu toriko ni naru ([Seohyun] toriko ni naru)
Oh oh oh oh oh (x3)
[Tiffany] kanpeki na bad girl yo
Oh oh oh oh oh (x3)
[Taeyeon] kanpeki na bad girl yo
Oh oh oh oh oh (x3)
[Jessica] kanpeki na bad girl yo
Oh oh oh oh oh (x3)
[Seohyun] kanpeki na bad girl yo
眩しいでした ヾ(≧∇≦)ゞ チガウゥ
o(^-^)o