Quad is a slang term referring to a quantity of marijuana that is equal to a quarter, or precisely 7.087 g, typically rounded to 7 g. A quad is a quarter of an ounce, which is often a standard amount of weed purchased for typical smokers that can last a number of days or weeks, depending on how much they smoke. You should be able to get seven 1 g joints from a quad or about 10 average-size bowls.