Primos is a type of beer that used to have considerable fame in the Islands, but has lost all popularity whatsoever.

I don't even know where'd you'll get a can of Primos since they've stopped production of it back in the late 90s.

There's a bunch of great luau threads on the Hawaii forum. Why not skip the luau (it's far too tacky) and just meet up at one of the many great restaurants on the Island?

Edit: Found a good article on what happened to Primos for you:
http://starbulletin.com/2002/11/30/news/whatever.html