Verb (5-dan, る, intransitive)
1. to be completed; to be finished; to be ready (e.g. to serve or eat)
おお、ちゃんと出来上がっている。Oh, it's properly finished.
2. to be very drunk; to get plastered
というか、既に酔って出来上がっている人もいるようだ。Actually, it looks like some people are already plastered.