twittumcised Share definition Flag The cutting off of the end of a Twitter message because it contained more than the allowed 140 characters. "I couldn't use the shortened URL at the end of the tweet because it had been twittumcised." twittumcised by The Word Guy February 2, 2010 0 0 Get merch Get the twittumcised mug. Buy Now — $32.95 See more merch