BTW, where did you find this poor baby? I hope not roll searching. Looks like the classic laundry dryer coin, or like @eddiespin said, "garbage disposal".
I get quarters like that in machine wrapped rolls from time to time. It amazes me that they make it through the sorting process. Then when I dump my coins, I can't get the machine to accept it. I've got a pocketful of bashed up coins now. Need to offload them somehow.