m10r Share definition Flag m10r means motherf****r. meaning m,then 10 letters andd then the R. oftenly used in texting. sometimes said as "Mlor". Hope this helps. "you m10r" this is when txted. usually written if parent is over sholder. m10r by chizbang February 25, 2009 0 0 Get merch Get the m10r mug. Buy Now — $32.95 See more merch
