ass groomer
A professional that deals with the aesthetics of the gluteal region. This is largely a male-dominated profession.  Their services are in high demand in this increasing vain U.S. society.  Ass grooming boutiques exist in trendy areas such as Seattle, Miami, and Providence, RI. 
Bob:  Hey Greg... nice ass!

Greg: Thanks man, I just got it done by the ass groomer on 13th and Main.

Bob: Word!