The typical buyer on craigslist. Unlike ebay, there is no obligation to buy something on craigslist. A deadbeat buyer is a person that informs you that they want to look at or purchase your product on craigslist. They will get your address and arrange for a time to come buy or look at your item. In reality, they never show up or call you to inform you that they are no longer interested.
"A guy named Mark called to say he is on his way over now to pickup the TV I have listed on craigslist."
One hour later, after no call or email.
"Looks like Mark was just another deadbeat buyer on craigslist."