The spaces on a car above the front tires and below the wheel rim. Because the area heats up during the winter, stray cats will often crawl into the space and perish when unsuspecting car owners start their cars without first checking the spot.
"Her cat died after it crawled into the dead cathole on her dad's car."
A deadhole is a glory hole in which a female is on one end, and a gigantic horse cock is on the other. The woman is then impaled by the horse cock. Hence the name "deadhole." It is also known as the horse hole.
Beth: "Hey Jenny, do you have plans this weekend?"
Jenny: "I'm going to the deadhole to get plowed by a gigantic horse cock and it will potentially (most likely) result in my death."