noun
Derogatory Kansai dialect term for a person who is a failure or disappointment.
あいつはほんまにスカタンやな。
That guy is a real failure, isn't he.
noun
Derogatory Kansai dialect term for a stupid or foolish person.
そんなこともわからんのか、スカタンが。
You don't even understand that, you idiot.
The origin is uncertain; it is a Kansai dialect term, possibly derived from すかす (to disappoint) and たん (a suffix), but the exact derivation is unclear.