The definition of a darb is slang for an excellent person or thing.
An example of a darb is a student who receives the grade of A in every class all through the school years.
Slang a person or thing regarded as remarkable or excellent
Origin of darbprobably contr. ; from obsolete slang darby, ready money, origin, originally , a strict usurer's bond, short for Father Darby's bonds ; from surname Darby or Derby