Alcohol, especially that which has been illegally prepared. Don't give me any more of that coffin varnish, or I'll be drunk in no time!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. inferior liquor. You want some more of this coffin varnish?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.