Roast down is another term for smoking pot. Alot of it to be exact. Usually done in a car to get maximum effect.
Jimbo: Yooooooo! What you doing after school?

Danny: Nothing much just chillin.

Jimbo: Then come with me after school and we'll fuckin roast down in my car.

Danny: Sounds good to me, cya after 8th Jimbo.
by James Francooooo September 11, 2013
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