goofbutts Share definition Flag Slang term for marijuana cigarettes (joints) dating back to at least the 1940s. "Uncle Jim was in the Navy during World War II and he said they smoked joints onboard all the time. They called them 'goofbutts'." goofbutts by HairyMelvin October 9, 2014 0 0 Get merch Get the goofbutts mug. Buy Now — $32.95 See more merch