中指指天说声草天说姑娘你别闹
[zhōng zhĭ zhĭ tiān shuō shēng căo tiān shuō gū niáng nĭ bié nào]
Roughly translating to 'Point finger at sky, say grass; the heavens laugh saying “girl, stop joking”'. This unconventional idiom hints playfulness and nonsensical humor which can be used lightheartedly to mock authority subtly or express defiance.