Rundown is the jizz that runs, or flows down the shaft of an erected penis upon ejaculation. It refers to all jizz that makes its way down the shaft, whether from sex with a tight vagina, or from masterbation.

1. the basis of an idea
2. telling the dj to turn up the music

A 2001 White Honda Odyssey that belongs to Tyler and he won't claim it

to get run over