Twininum Share definition Flag A word used to describe a similarity between two people, similar to saying 'twins!' or 'twinsies!' or even 'hey same!' or 'relatable!' You havent slept in three days too? OMG Twininum (Twin-nuh-num)! Twininum by Ziganometry August 2, 2023 0 0 Get merch Get the Twininum mug. Buy Now — $32.95 See more merch