Simply put, a spliff is a special mix of tobacco and marijuana properly rolled into a joint. This unique blend has been a part of cannabis culture for a long time. This has seen it being incorporated into different types of songs, movies and art used to promote the stoner culture. Easy Skanking, the famous song from music icon Bob Marley comes to mind as he started with “excuse me while I light my spliff”.
Source: https://cannabisworld.biz/2022/07/25/do-people-still-smoke-spliffs-wait-what-is-a-spliff-exactly/