making a muthler Share definition Flag is an expression for a hobby investment banker going home too earlymuthler is derived from mute damn it, he is making a muthler again ->this lame guy leaves us high and dry every time making a muthler by Nick Leeson January 4, 2010 0 0 Get merch Get the making a muthler mug. Buy Now — $32.95 See more merch