skunk eye

skunk eye
 n.— «[David Letterman] is also oddly physical: he does facial shtick (the old skunk eye, for example); he plays with his suit; he imposes his body even as far as the camera.» —by John Limon Stand-Up Comedy in Theory, Or, Abjection in America Nov. 1, 2000. (source: Double-Tongued Dictionary)