Help with a song

[MissStFan87]

I heard it on XM Radio on my way home last night. I don't remember much about the song, other than the "you don't know, you don't know, you don't know" in the chorus. I think that ("You Don't Know") was the name of the song, too. It was kind of a rap song from what I remember, but it had to have some rock to it because I'm pretty sure it was on Ethel, a rock channel. I remember the band name being a long name/word, but that's about it.

Any help would be appreciated. I've had the chorus in my head ALL day, and Google hasn't helped any. There are just too many songs with "you don't know" in them. So, I'm here as a last resort...