vagEinstein Share definition Flag Pronounced: Vaj-Einstein. A guy who is a genius with regards to female sexual anatomy. I started dating Billy because Laura said he was a real vagEinstein. Turns out he's just 'OK' in the sack. vagEinstein by M. A. S. February 26, 2008 0 0 Get merch Get the vagEinstein mug. Buy Now — $32.95 See more merch