Kansai dialect. そうや is the Kansai form of そうだ. ほんま is the Kansai equivalent of 本当 ('really, truly'). けったくそ悪い is a rough Kansai expression meaning 'damned bad, rotten, irritating' — けったくそ literally 'fart-shit' is an intensifier. The expression conveys strong emotional dissatisfaction with a bad situation, more vivid than standard Japanese equivalents.