mufuckin uhhhhh Share definition Flag when you are trying to roast or make fun of someone but cant think of anything. DON'T EVEN SAY 'NUN TO ME BOOOY, YOU LOOK LIKE A MUFUCKIN UHHHHH KOALA WITH A TAMPON mufuckin uhhhhh by Daddybighnands March 17, 2015 Get the mufuckin uhhhhh mug.