scruff(n = noun.body) nape, nucha - the back side of the neck;
is a kind of back end, backside, rear
is a part of cervix, neck

   Scurf. [1913 Webster]

   The nape of the neck; the loose outside skin, as of the back of the neck. [1913 Webster]

scruff, n. the back of the neck as used to grasp and lift or drag an animal or person by (esp. scruff of the neck).

scruff, n. colloq. an untidy or scruffy person.

Etymology:
orig. = SCURF, later 'worthless thing', or back-form. f. SCRUFFY