“I just brought the ‘freak’ to Freaknik,” says Campbell in the new Hulu documentary “Freaknik” which he executive-produced with Atlanta music mogul Jermaine Dupri. “Somebody had to do it.” But beyond all the booty-shaking before “twerking” was even a word, the “Me So Horny” rapper sums up the cultural impact that made Freaknica — as Atlanta rapper Lil Jon describes — “the greatest