1 definition by Black Crow 1038
The hole on the side of the bowl of a marijuana pipe (usually glass pipes), with which you can control the flow of air through the bowl. Covering the shotgun increases airflow into the bowl, making whatever you are smoking burn faster. Uncovering it lets air into your lungs through the shotgun as well as through the bowl.
by Black Crow 1038 November 16, 2004