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Nothing; anything at all (when used in negative statements). I have to admit that I know doodly-squat when it comes to computers. Unless you give me something in writing, that promise isn't worth doodly-squat.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.