i-adjective
annoying; irritating; frustrating
Slangy, emphatic form of うざい. Conveys a stronger sense of irritation, often used by younger speakers. The English gloss 'jumbled up' and 'confused' are less common; the core meaning is 'annoying' or 'bothersome'.
あの人の話し方、うざっこいんだよね。
That person's way of talking is really annoying, you know.
毎日同じ広告が出てきてうざっこい。
The same ad popping up every day is so irritating.