scat (interj.) 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.1) Look up scat at Dictionary.com
"nonsense patter sung to jazz," 1926, probably of imitative origin, from one of the syllables used. As a verb, 1935, from the noun. Related: Scatting.
scat (n.2) Look up scat at Dictionary.com
"filth, dung," 1950, from Greek stem skat- "dung" (see scatology).