Top Definition
A toothless beggar or homeless man.
A mumblecrust shouted something at me today, but I didn't understand him.
by Reubenalexander July 03, 2011

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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

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Noun.
1. Dried food near older peoples mouth
2. Food that missed ones mouth
3. Digusting looking food
She had a bunch of mumblecrust on her face, but I didn't want to say anything.
by C. Pendergast November 18, 2006

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