Definition of "diddly-squat" [diddly-squat]

• Slang A small or worthless amount. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Republicans don't know diddly-squat about economics and financial policy."
• "Other than getting into a decent grad school and associating with the cream of your generation, getting straight A's means diddly-squat in the real world, where it's all about hustle, determination, focus, dressing right, sucking up, and who you know."
• "I would do diddly-squat because there is no way that a novel – or a video game, television show or film, for that matter – can have any possible input into a criminal act."