A term used for a person who cannot stop themself putting dirty things in their mouth.
"Bloody hell,I caught Ethel in the bins again!! She's a rite ruddy mucksucker of that there is no doubt, I can tell you."
'Jeremy knew he was letting his compulsion to put dirty things in his mouth get the better of him. It occured to him when he could not stop himself from thinking about chewing on a used condom he passed by whilst on his way to work that morning. "I am a dirty Mucksucker" he whispered to himself, "but damn I like it."'