When one spreads thier ass cheeks and rubs thier rusty bullethole on something.; Similar to how dogs enjoy rubbing thier ass on grass, reference 'The Fisher King'. While 'dog-assed' isn't used in the film, reference for dogs rubbing thier asses on grass.
"Damn dude that looks like hell, who dog-assed my newspaper?"
"Omg what is that streak on the carpeting who dog-assed it?!"