Bayinah Share definition Flag An eccentric girl who is usually dumb or oblivious. Also enjoys dressing like a dinosaur. For the longest time I thought it was a year ahead of the actual date, I felt like such a Bayinah when I found out it wasnt. Bayinah by waterbottle09 August 4, 2010 0 0 Get merch Get the Bayinah mug. Buy Now — $32.95 See more merch