diddly-shit

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diddly-shit

1. noun, rude slang Nothing; anything at all (when used in negative statements). I have to admit that I know diddly-shit when it comes to computers. Unless you give me something in writing, that promise isn't worth diddly-shit.
2. noun, rude slang Useless. Ugh, this diddly-shit printer has stopped working again, and I have a paper to print!
Farlex Dictionary of Idioms.

diddly-shit

and doodly-shit
1. n. anything at all. (Usually in the negative. Usually objectionable.) I don’t give a diddly-shit what you do!
2. mod. virtually worthless; useless. (Usually objectionable.) I’m gonna take this diddly-shit watch back to the store and get my money back.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • doodly
  • diddly
  • diddly-squat
  • cling
  • clung