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Nothing; anything at all (when used in negative statements). I have to admit that I know diddly-squat when it comes to computers. Unless you give me something in writing, that promise isn't worth diddly-squat.
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.
diddly-squatand (doodly-)squat (ˈdɪdliskwɑt and ˈdudliskwɑt)
n. nothing. (Folksy. Originally black or southern.) This contract isn’t worth diddly-squat.