Punaba is short for "Plain Ugly Not Accepted By Anyone"
So if your SO ugly that not even alternatives and goths accept you among the community, then you'r realy punaba.
I cam on the word a while ago when I was at my old high school. I saw some kid's coming by and I realy thought DAMN they realy have no-one and they'r most likely not going to get any friend either... they'r plain ugly not accepted by anyone... hey.. punaba! Have used it ever since and now ALOT of people use the word. Realy sounds nice to say it hehe.
Look at that guy there, he has NO-ONE, no friends, he's damn ugly and no-one wants him.... he's punaba.... oh man yeah... punaba....