A person with no class, mean spirited, evil, or rude. An insult meaning stupid and pathetic. Loser. A bunch of homophobes that stage a fake prom in order to prevent a few gays and people with disabilities from attending the real one.
Also part of the phrase, "That's so itawamba" meaning so dumb, idiotic, evil, mean, stupid, dumb. The perfect response to "That's so gay."
Person one: Did you see that tv show last night, that was so gay.
Person two: No, that's so itawamba.