A pissed-off principal has cancelled all of the student dances at Leemore Union High School in California because he was freaked out by kids freaking.
According to the Rap Dictionary, the meaning of "freak" is:
1. Dance in a provocative way.
2. Have sex.
3. Person who practices the above things; sexually aggressive female (never missing a beat).
4. To take out the filter paper from a Black & Mild pipe-tobacco cigar. "I'm going to freak this Mild"
The principal is particularly bothered by number 1, although I bet numbers 2 through 4 wouldn't thrill him either.
Link (to AP report)