User blog comment:Guts!/Anime Depiction of Luffy's Gear Second/@comment-5387880-20130528110401/@comment-5962458-20130528221025

Actually the word "kopiase" is also the past tence of the verb "kopiazo" that means labor so the translation was surpisingly correct.In this case however the word is used with another meaning that is discribed as such:

"it's an invitation to someone to join your company; sit beside you" it is commonly used by older people especially when they invite someone to join them and share their food or drinks.

Hope i cleared that up for you :)