If I can't sing it, it's not music

I attended a New Year's party this year that seemed to feature one song over and over. This song stains my memory so badly that I shall always remember it, sort of like a person getting herpes, it's there for life. For some reason I realized that I didn't know any of the words other than YUUUUUU and OHHHHHH, which is what the song mostly is. So, I looked them up. Here they are: Soulja Boy - Crank That. After carefully reading through them, I still don't understand it. Can someone please pull a Bill Maher and translate it for me?