know one's shit
Proposed by a contributor, not yet supported by evidence.
Meaning · English
Be knowledgeable or skilled in a particular area
Nghĩa · Tiếng Việt
có kiến thức hoặc kỹ năng trong một lĩnh vực cụ thể
Machine-translated — suggest a fix
Literally: understand one's excrement
Where it’s used:
Used
Widespread English
Examples
He really knows his shit when it comes to car repairs
AI-drafted example auto-approved by rule (illustrative, not a corpus attestation)
Sources & notes
Listed in Wiktionary’s “English idioms” category (retrieved 2026-07-29); definition pending editorial review. Definition drafted by AI (@cf/meta/llama-3.3-70b-instruct-fp8-fast) and auto-approved by rule on 2026-07-31; pending editor spot-check.
Common questions
What does “know one's shit” mean?
Be knowledgeable or skilled in a particular area Literally: understand one's excrement
Is “know one's shit” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.