bitchina Share definition Flag A bitch's vagina. One of the dirtiest words you can say. Invented by some UC Davis girls in Precalculus. Use it wisely, use it well. "Why don't you go shove it up your bitchina!!" bitchina by KatandGaby November 6, 2008 0 0 Get merch Get the bitchina mug. Buy Now — $32.95 See more merch