I'm searching for a song, please help.. its goes like "when you"?

this song was released 4 or 5 years ago. I was younger didn't understand fully at that time so couldnt remember what she really used to say in song,.. it was played on radio.. it was like "when you keep up or kick up or kit up" i dont exactly know.. then "perfect perfect" at the end of next line she used to say. it was a big hit i guess.. its a fast song,, of a female singer.. Please help me.. if you know about this song.