Mareblue's Share definition Flag A mareblue is a slag term for the word "Shit". I had hell of a mareblue this morning.I need a mareblue.I've had two mareblue's today. Mareblue's by Slick, Ravi, Noddy, Captain. August 25, 2009 0 0 Get merch Get the Mareblue's mug. Buy Now — $32.95 See more merch