Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Slick
Slick as a ribbon.
—Anonymous
Slick as greased lightning.
—J. R. Bartlett’s Dictionary of Americanisms
Slick as sin.
—J. R. Bartlett’s Dictionary of Americanisms
Slick as a whistle.
—J. R. Bartlett’s Dictionary of Americanisms
Slick as grease.
—J. R. Bartlett’s Dictionary of Americanisms
Slick as a butterfly’s wing.
—Thomas Davies
Slick as soap grease.
—O. Henry