Biebgasmic Share definition Flag The definition of Justin Bieber, another way of saying he's sexy, or orgasmic. Did you see that shirtless picture of Justin? He looked so biebgasmic! Biebgasmic by sam x3 April 21, 2011 0 0 Get merch Get the Biebgasmic mug. Buy Now — $32.95 See more merch