Slag [insult] [diss] [rag] Share definition Flag Put down, insult, etc. "dont try to slag me downbecause i know your right." Slag [insult] [diss] [rag] by trevortherovert July 21, 2005 0 0 Get merch Get the Slag [insult] [diss] [rag] mug. Buy Now — $32.95 See more merch