mrrt Share definition Flag A word used to express sadness, see also meep. Can be slightly shortened to "mrr". Me: ...;-; Mrrt... Friend: Bored? Me: ...yeah...and tired...and hungry... Friend: *hug* ^^; mrrt by she's a strange one April 8, 2006 0 0 Get merch Get the mrrt mug. Buy Now — $32.95 See more merch