I guess when gangsta rap started to take over the airwaves in the early '90s MC Hammer thought he should change his style and beef up his street cred. I don't think small bathing suits, pool parties and slutty backup dancers was the right move though.
Hammer's 1994 release The Funky Headhunter was a large departure from his squeaky clean pop image and was definitely a very big gamble. Many felt that the "Pumps and a Bump" music video was too graphic a depiction of the male form in a video, and as a result the video did not receive much airplay on MTV. This pretty much ended the career of the hyper Oakland MC. Take a gander for yourself.
Eventually, on April 3rd, 1996 MC Hammer declared bankruptcy.