Not know (one's) ass from a hole in the ground slang rude
To be extremely stupid; not to be alert
She didn't know her ass from a hole in the ground when quitting such a decent job.
What! You refused such a good price! You don't know your ass from a hole in the ground.
The origin of this slang is not clear.
If you are really thankful, what do you do? You share.
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Adequate measures or actions
There were no half measures in the wedding from the very beginning to the end.