Song Question

I have a question... during the party scene at the hotel there is a song playing in the background that equates boxing to spiritual warfare. I am not sure of the name of the song, but I believe it is called Twelfth-Round Knockout because the chorus is a repetition of the words "Yo, it's a twelfth round knockout" (3x) and then the statement, "I'm goin' all twelve rounds and I'm never gonna drop." Can anyone provide any details at all on the song and/or artist...? don't really want to buy the sdtk because I just want to find that one song.