A word that is used almost exclusively for describing the quality of weed, or rather lack thereof. It is a lack of dankness, a lack of knock-you-off-your-ass-ness that basically means your weed is crap, or not up to par. On rare occasions, it can used to describe an event that should have been dank/awesome as fuck, but completely went sour.
Dude this weed has a lot of color and smells great, but overall its just dankappointing.
Dang man, this shwag is just dankappointing...
This party is dankappointing....