Definition

A reference to damaged goods or broken merchandise, originating from Kmart's department 605 where defective items were sent. Now used as a dismissive way to call something damaged or worthless.

Example Usage

Check out that dent in his car—that's a 605 if I ever saw one.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=605&defid=1490487)