3M'n Share definition Flag 3M’n is the same as Posted (chilling in one spot). The slang is twice removed from Posted and derived as Posted, Post-It, 3M. 1 - I'm 3M'n (posted!) 2 - 3M'n at the crib 3M'n by khanvik December 9, 2007 0 0 Get merch Get the 3M'n mug. Buy Now — $32.95 See more merch
