Twerking: What is it, and why did it get high school students suspended?

Dozens of students have been suspended from a San Diego high school after teachers saw a video online of the students 'twerking,' according to news reports. 10News, the local ABC news affiliate in San Diego reported that students from Scripps Ranch High School recorded the video "during school, on the property and with school equipment," and that the school district board may review the video to address complaints that the punishment was too severe.