Customer + Cunt = Cuntstomer. Describes retail customers who think you should wait on them hand and foot. Especially try to act like they know more than you when they ask you a question.
I told the cuntstomer we don't return Betamax players, especially ones without reciepts.
A customer so vile and unpleasant that every attempt to help them with their particular problem only results in frustration and anger. At times it feels as though one is talking with a solid wall of stupid while attempting to help this type of person.