5000, phr. — Green’s Dictionary of Slang

5000 phr.

[‘I’m outta here’, which evolved to ‘I’m Audi’, and to 5000 after the Audi 5000 car]

(US black/teen) goodbye, I’m off.

1995		L. Stavsky et al. A2Z 36/1: Yo, five thousand! there’s my posse in that ride.
2002		Teen Lingo: The Source for Youth Ministry 🌐 outtie 5000 n. (derived from ‘outa here’ mixed with the car the Audi 5000) A saying conveying that a person is about to depart. [...] Some shorten it and just say ‘5000!’.