An amusing, "
clean" insult featured in Orbit
gum commercials as part of their "Dirty Mouth? Clean it up with Orbit" promotion that highlighted the gum's approval by the American Dental Association and Indian Dental Association due to its ability to improve dental health.
The cleanly insulting "donkey door" is probably a replacement for "
asshole" as donkeys are also called asses and doors are portals, or holes.