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2.
when poo clings to your arse hairs.
'...hey dude i can see a chumnut hanging from your ass man!'
by fluffy ball sacks June 26, 2007
 
1.
A derogatory term. An insult. A combination of the word "chum" which is bloddy fish guts used to attract sharks. And the word "nuts" which means testicles.
Hey chum nuts, wheres my fifty dollars!!
by Dan Ram June 10, 2005