Doobie, a term used to refer to a joint or a rolled marijuana cigarette, has several synonyms in popular culture. Some refer to it as a "blunt," a cigar-like roll that is larger in size and filled with marijuana. Others use the term "spliff," which is a joint that blends tobacco with marijuana. Another synonym for doobie is a "roach," which commonly refers to the end of a joint that has already been smoked. The term "j" is also used, particularly among younger users, to refer to a joint or doobie. While these terms may vary across regions and cultures, they all refer to a rolled marijuana cigarette that is typically smoked for recreational use.