What does Grape Juice have to do with Purim? In what way is it better than seltzer? I mean, if you like it then it is Lekavod the Seuda, but for its own sake, I don’t think it is Mevasem. Perhaps I just never took enough.
Besumi is the positive term for Shikkur. As I pointed out in another thread, the Gemara uses it in Shabbos 66b for drinking too much. Perhaps it means tipsy or Gelufin, but Rashi says Shikkur. Shikkur is not Aramaic. The Aramaic term would be Ravi, but that is a derogatory term. We don’t say you should imbibe wine. We say drink yourself happy.
The Gemara in Shabbos is also talking about having drunk enough for them to try to get rid of its effects. However, we don’t refer to Talmidei Chachamim as Ravi.
Some bring proof from Raba’s response to Reb Zeira that there is an unspoken Maskana that we actually shouldn’t drink. I wonder if, perhaps, there is proof from there to the contrary. If Raba would have stopped drinking then he would have no problem eating the Seuda together with Reb Zeira. From the fact that he didn’t want him to come we see that he continued to drink but didn’t want Reb Zeira to come and put himself in harm’s way.