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"
by MrZuckerman May 11, 2020
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