Definitions by Juicy poo
Retainer
The word "retainer" used in rap vernacular often is referring to keeping a thug on hand that is willing to do dirt. The celebrity retains this person's services thru cash payment, or other bartering options such as weed or pussy in the event that a punch needs to be thrown (or otherwise) and the celebrity would be open to a potential costly lawsuit, whereas the retainer does not have enough money worth be sued for, etc.