The act of searching through an ashtray to use the remaining tobacco out of used and dead cigarette butts to hand roll a new cigarette.
"I don't have any money for a pack of smokes, so I am about to field strip this ashtray and roll one."
The act of stubbing out a cigarette and knocking out all the loose tobacco and embers so you can safely dispose of the butt in a trash receptacle when one presents itself.
Todd: "Can I just flick this butt in their yard?"
Me: "No, field strip it and put it in your pocket until we go inside. Why are you such a rube?"