It is originaly the big pot that jamaicans use, as in a duchy pot, although it has been used for a joint or blunt, its original meaning is the duchy pot

Carried from a term meaning a small nation (eg. Luxembourg, Lichtenstein), a dutchy is a room in which the air is weed (and vice-versa).

a spliff u muthafuckas who dont kno shit and have to come on this gay site to find out ur goddamn definitions