Because language evolves and the meaning of a word depends on the current cultural majority's interpretation. In this case, pimp is used in the vernacular to me

Because language evolves and the meaning of a word depends on the current cultural majority's interpretation. In this case, pimp is used in the vernacular to mean, "soup up". If you're going to be consistently offended by etymology, then I hope you also avoid ever using words such as hysterical, or grandfathered in.