A musket is a small cardboard tube (one typically found in a pack of RAW cones)with a filter, filled with the weed left over from rolling a cone or joint. Using a "ramrod" the weed is packed down and the tube is trimmed. A Muskets resemble a one hitter but can last for multiple hits.
Some guy with a Confederate flag cowboy hat wanted to smoke weed for the first time so I packed him a musket. Two hits turned him into general Lee.
Brown Musket describes a sexual act which typically involves at least one male. It occurs when an individual takes a dab of excrement onto their finger and then inserts it into the pee-hole of an erect partner. The pinky is most often used, but more advanced 'Brown Muskateers' often graduate to the use of the larger digits when a willing partner is able to withstand what is usually considered an intensely painful experience. The source of the fecal matter used is irrelevant but most often belongs to one of the involved participants. Extra points are earned the heavier a musket is loaded. Common side effects include urinary tract infections, as well as pissing shit.
Mary was mildly disgusted, but not altogether surprised when Ian's dick tasted like shit after she delicately performed her first Brown Musket on him.