Doesn't know his ass from his elbow Meaning in English
expression
Definition
This informal and humorous expression means someone is completely ignorant or clueless, especially about what they're supposed to know or do.
Usage & Nuances
Highly informal, often humorous or mildly insulting. Usually directed at someone showing clear ignorance, especially in practical or important matters. May be seen as rude, so use with caution. Common collocation: 'He doesn't know his ass from his elbow when it comes to computers.' Avoid in formal writing.
Example Sentences
He doesn't know his ass from his elbow when it comes to cooking.
basic
My boss doesn't know his ass from his elbow about computers.
basic
She doesn't know her ass from her elbow in math class.
basic
Honestly, he doesn't know his ass from his elbow when fixing cars, so don't ask him for help.
natural
I tried to explain it, but she doesn't know her ass from her elbow on this topic.
natural
You can tell he doesn't know his ass from his elbow just by the way he answers questions.
natural