Hinna means "tasty" in Ainu. The "Hinna, Hinna" line is a reference to manga Golden Kamui (just like, incidentally, the dungeon eating is a reference to Dungeon Meshi).
Yaaay, eating in a dungeon, yaaay!You...don'cha have any pride at all?To be continued...Yummy-nummy! Apparently, ヒンナ=hinna means "Tasty" in Ainu. The line in particular is a reference to the manga Golden Kamui.Ah—it's a monster!!