scat (1) Look up scat at Dictionary.com
"go away!" 1838, from expression quicker than s'cat "in a great hurry," probably representing a hiss followed by the word cat.
scat (n.2) Look up scat at Dictionary.com
"nonsense patter sung to jazz," 1926, probably of imitative origin, from one of the syllables used.
scat (3) Look up scat at Dictionary.com
"filth, dung," 1950, from Greek stem skat- "dung" (see scatology).