Informal adjective meaning covered in crud, dirty, sticky, or of poor quality and unpleasant.
From 'crud' (early 1900s slang for filth) with the adjectival suffix '-y'; became common in American English as slang for something disgusting or inferior.
During World War II, American soldiers used 'cruddy' constantly to describe uncomfortable conditions—it became so popular that it spread from military slang to everyday speech!
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