A condition whereby the asshole is constantly stinking whether its clean or dirty. Persistent stink is usually caused by a weak sphincter coupled with a leaking of clear colonic fluid. This ass juice rapidly spreads and quickly penetrates the underclothing and outerwear causing the high malodorous scent. This scent can be readily detected simply by walking behind the sufferer. Walking up stairs directly behind a person with this condition is particularly unpleasant. Washing the asshole at this point becomes pointless as the leaking fluid will soon reappear with the same unpleasant characteristics. An old wine cork will sometimes be the simplest solution.
Jesus Christ man! Don't you ever bathe? You've got the worst case of assholatosis that I've ever smelled. For God's sake man, clean up your act.
The unnaturally pronounced oscillation of the ass during motion such as walking/running. Can be seen in models strutting down the runway, toned high level athletes, etc. Similar to the way a cheetah's shoulder blades oscillate when stalking.
Damn, that girl's got some assillation going on. Look at that bootygo!
or
Those speedskating suits don't leave much to the imagination! You can even see the assillation!