Slang reference to a particular type of marijuana. Presumably it is called Indo because it is grown in Indonesia (or India, I have heard both stories and cannot verify the authenticity of either). Indo is usually recognizable by the purple leaves intermixed with the green. It is considerably more potent than most common forms of marijuana used in America. Rappers, especially those from California, love extolling the virtues of Indo, as it is a frequently a complement to a forty, Cisco (back in the day), Tanqueray, or the rotgut of your choice.