A descriptor establishing that a idea, object, thing, place or quality is somthing liked by a particular group or subculutre, or in some instances an individual. However the subject in question would be thought pathetic, laughable, or pointless by the vast majority.
The etymology of this word being that a given subject is badass to some, but sad to everyone else.
"Wow man... thats sadass"
"Alright guys listen, I know this is sadass but..."