The gross crusty white shit that forms in the corners of old people's mouths when they talk.
That teacher had such bad mumble crust that I had to drop the class.
by Dopegirls September 14, 2010
Can you define these popular missing words?
A toothless beggar or homeless man.
A mumblecrust shouted something at me today, but I didn't understand him.
by Reubenalexander July 03, 2011