Ineffable means "too great or extreme to be expressed or described in words". It's often used to describe something that is deeply moving, awe-inspiring, or overwhelming.
Effable is the opposite of "ineffable" and means "capable of being expressed in words".
It's possible that "effanineffable" was intended as a humorous or ironic way to describe something that is both indescribable and expressible, but it's not a standard word in the English language.