A person that is totally obsessed with asses.
That dude is totally obsASSed, because all he does is think about naked butts.
Constantly pondering how to grip some of the nicest ass around.
Girl with nice ass: That beastly GK from da boro is completely obsassed.
Girl who hangs out with (above) to look better by comparison: Yea i know hes totally checkin you out.