18in Share definition Flag Reppin, Representing, etc.R is the 18th Letter in the Alphabet, R = Reppin Person: Yo where you reppin? Dude: Yo, I'm 18in New york muh nugga Person: Word? 18in by RogRogTheTrog May 21, 2009 0 0 Get merch Get the 18in mug. Buy Now — $32.95 See more merch