Omen is in one of her "good moods" and asks the Huntsman if he wants to share a drink with her.
Honestly, Omen drinks pretty much. Unlike Huntsman, who does not approve of such habbit. Of course, he can have a beer from time to time, but he usually doesn't drink anything stronger than that, while Omen prefers whiskey, rum and gin. Huntsman tends to call Omen a "drunkard" after she got so drunk, that she wasn't even able to walk. He had to carry her to her room and look after her all night as she... ehem... felt the consequences of such excessive drinking veeeery soon. Well, on the other hand, she had a reason to get drunk. But she will not get that drunk ever again.