1. A crazed person of African descent convinced that (s)he descended from the ancient tribes of Israel.
2. Someone who will approach you if you're Jewish, asking what tribe you're from, after which you will regret ever responding if you answer him.
3. A hilarious lunatic who delights people all around campus with his antics.
Did you see that weirdo on the train? I haven't seen someone that crazed since that Black Israelite approached me in front of Hillel!