n. nonsense syllables sung to music. (Refers to a [primarily black] jazz practice in the jazz era.) : She used to do scat but moved on to blues.
exclam. Go away! (Usually Scat! Often said to a cat to get it to go away.) : Get out! Scat! Beat it, cat!
in. to leave. : You guys scat now. I have to go to work.
n. heroin. (Drugs. From an old term for dung. See also shit.) : Bart is trying to sell scat in the neighborhood again.
n. inferior whiskey. : You got anything better than that scat, bartender?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
scat (1)
"go away!" 1838, from expression quicker than s'cat "in a great hurry," probably representing a hiss followed by the word cat.
[skat] 
