The curve whose tangent and binormal indicatrices are slant helices is called a slant-slant helix.
 
 In this paper, we give a new characterization of a slant-slant helix and determine a vector differential equation of the third order satisfied by the derivative of principal normal vector fields of a regular curve. In terms of solution, we determine the parametric representation of the slant-slant helix from the intrinsic equations.
 
 Finally, we present some examples of slant-slant helices by means of intrinsic equations.