molar masher Share definition Flag a humongusly large penis wich mashes molars or other teeth when receving oral sex jimmy mashed that girls molars when she was blowing him therefor she called him a molar masher and had a huge dentist bill. molar masher by iceman410 April 21, 2009 0 0 Get merch Get the molar masher mug. Buy Now — $32.95 See more merch