Oh, and yob, too

I've been following Blunkett's and The Sun's resolve to rid the UK of domestic terrorism, and wonder about the word "yob". Origin? -- from "boy" spelled backwards? Pronounced to rhyme with "hob"?

Wish we had ASBO's here, because naming a thing helps. If the only thing a society chooses to do is wait until horribly criminal action occurs, the waste is enormous.