Disappressing is an adjective. It is a combination of the wordsdisappointing and depressing. It is used to describe something that is both disappointing and depressing at the same time.
A combination of disappointing and depressing. When you can't decide quite how bad something is, if it's depressing or just disappointing, call it both... disapressing.
Ryan: Yo volleyball sucked day, it was not fun.
Sean: That shit was disapressing.