He said that the relatively sudden appearance of Chelsea on the bandstands of the Hillary campaign looked like she was being pimped by her parents. Apparently "pimped" is not as far into to mainstream vocabulary as some, especially Shuster, think it is. Given his quick intelligence and his no-nonsense delivery, Shuster probably picked up on one of Hillary's ploys, like the tear-welled eyes of New Hampshire, and called it for the pimps.
While moving I have missed many Countdown programs and discovered that there is life without. I will abandon Countdown entirely if Shuster is not restored to his job. Jim Lehrer punctuated by Bill Moyers will suffice.
See also: this from Huffington Post.