not know diddly-shit about sth
强调对某事物完全不了解；属粗俗俚语，正式场合避免使用。
He doesn't know diddly-shit about fixing cars.
他对修车一窍不通。
垃圾，废物，毫无价值的东西（或人）
垃圾；废物；屁都不值的东西；不值得采用的东西(或人)
something worthless; a person or thing of no value
垃圾；废物；无聊的；无趣的
a small worthless amount
After all that hard work, we got diddly-shit for compensation.
辛辛苦苦干了半天，我们得到的补偿屁都不值。
用法提示：名词，表示毫无价值的补偿。
He knows diddly-shit about computers, so don't ask him for help.
他对电脑一窍不通，所以别找他帮忙。
用法提示：名词，强调一无所知，毫无价值的知识。
The team played diddly-shit defense and lost the game.
那支球队的防守形同虚设，输掉了比赛。
用法提示：名词，形容防守毫无效果。
强调对某事物完全不了解；属粗俗俚语，正式场合避免使用。
He doesn't know diddly-shit about fixing cars.
他对修车一窍不通。
多用于抱怨别人什么都没做。
They sat around all day and didn't do diddly-shit.
他们整天闲坐着，什么都没干。
表示某物毫无价值。
This old phone isn't worth diddly-shit anymore.
这部旧手机现在一文不值。
表示对某人来说完全不重要。
That promise doesn't mean diddly-shit to me now.
那个承诺现在对我来说毫无意义。
grammar · medium
易错句子He doesn't know diddly-shits about fixing a car.
正确表达He doesn't know diddly-shit about fixing a car.
表示“极少的量、一文不值的东西”时，diddly-shit 是不可数的量名词，通常只用于否定句，因此不能再加复数词尾 -s；去掉 -s 改用原形即可，句中的否定意义由 doesn't 承担。
grammar · medium
易错句子Be careful — the dog left some diddly-shit on the path.
正确表达Be careful — the dog left some shit on the path.
diddly-shit 并不表示“粪便”，它指的是“一点点、毫无价值的东西”，并且多用于否定语境；要表达“屎”应直接用 shit。删去 diddly- 既保留了原句想说的意思，也符合该词的真实含义。
两者都表示“极少量、毫无价值”，但 diddly-squat 侧重“任何东西、丝毫”，常见于 not know/have diddly-squat 结构；diddly-shit 更粗俗，且更常直接作名词指“垃圾、废物”本身。
jack shit 与 diddly-shit 都粗俗且常用于否定，但 jack shit 更固定地表示“什么也没有、丝毫不”，多跟在 not do/know 后；diddly-shit 还可直接指“废物、垃圾”这类东西或人。
diddly 是 diddly-shit 的较温和版本，粗俗度低，常出现在 not know diddly 这类否定结构；diddly-shit 更粗俗、语气更重，且能指“毫无价值的人或物”。
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