Slang for "Outtah here." Which is slang for "I'm getting out of here." "Or I'm leaving." Rap culture sign off in which the recording artist is being braggadocious about what he/she is driving when they leave the scene. The Audi 5000 was a popular luxury car of the time. This coupled with the fact that "Audi" sounds like "Outtah." A pun if you will.
This song is over. I'm Audi 5000, G.