Dirty fucking butt-sex, often not consensual, usually resulting in much more dampness then the name implies. Also, as an adjective, it is the actual asshole-to-colon trail a big cock takes when butt-fucking someone.
What I call homo-sapiens who are addicted to abscesses.
Person 1: Are you addicted to abscesses?
Person 2: Yes.
Person 1: snap back comma (,) the old dusty ass trail (postal code 10457-2219 on the topic of zippers)...
The nickname given to "King Of The Hill" star Hank Hill by his grade school bully Caleb in the season 10 episode, "Hank's Bully." The original moniker is lengthened by Caleb to its full title of "Dusty Old Bones, Full Of Green Dust."
Caleb: "Dusty Old Bones, Full Of Green Dust! Dusty Old Bones, Full Of Green Dust! Dusty Old Bones, Full Of Green Dust!"