messy marty Share definition Flag when someone rubs shit on your teeth when you are sleeeping on a air matress. Bill? Did you give me one of those messy marty's last night? You got it all over the air matress and my gums. messy marty by Offrey J June 11, 2006 0 0 Get merch Get the messy marty mug. Buy Now — $32.95 See more merch