know one's head from a hole in the ground
English
[edit]Verb
[edit]know one's head from a hole in the ground (third-person singular simple present knows one's head from a hole in the ground, present participle knowing one's head from a hole in the ground, simple past knew one's head from a hole in the ground, past participle known one's head from a hole in the ground)
- Synonym of know one's ass from a hole in the ground