knowing one's ass from one's elbow

Questions

What does knowing one's ass from one's elbow mean?

present participle and gerund of know one's ass from one's elbow

How to pronounce knowing one's ass from one's elbow

1. Open the pronunciation page — Open the Speakur entry for “knowing one's ass from one's elbow”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “knowing one's ass from one's elbow”.
4. Repeat and practice — Say “knowing one's ass from one's elbow” aloud, matching stress and vowels until it feels natural.