Roach Vessel

A Roach Vessel (shortened to RV) is the act of placing the last bit of the blunt into the bowl of your pipe or bong.
An alternative to Wu-Tanging, an RV is an effective way to avoid burning one's fingers, and to conserve resources.

Jose: "We're at the last bit... want me to light up another one?"
Kent: "Hold on a minute, I'll make a roach vessel"
Sierra: "For sure, RV it"