Source : Webster's Revised Unabridged Dictionary (1913)

Scat \Scat\ (sk[a^]t), interj.
   Go away; begone; away; -- chiefly used in driving off a cat.

Scat \Scat\, Scatt \Scatt\, n. [Icel. skattr.]
   Tribute. [R.] ``Seizing scatt and treasure.'' --Longfellow.

Scat \Scat\, n.
   A shower of rain. [Prov. Eng.] --Wright.

Source : WordNet®

scat
     n : singing jazz; the singer substitutes nonsense syllables for
         the words of the song and tries to sound like a musical
         instrument [syn: {scat singing}]
     [also: {scatting}, {scatted}]