Compassion Boner Share definition Flag The state of easily and unwittingly spilling your compassionate energy into a less constructive cause. She had a compassion boner and gave her last 5 dollars to that stereo thief. Compassion Boner by Slanglord9000 May 8, 2016 0 0 Get merch Get the Compassion Boner mug. Buy Now — $32.95 See more merch