doesn't know beans

Translations
(кто-то) ничего не смыслит
She doesn't know beans about cooking, so dinner might be interesting.
Она ничего не смыслит в готовке, так что ужин может быть интересным.
Definitions
This phrase means that someone is ignorant or lacks knowledge about a particular subject or in general. It is often used to suggest that a person is uninformed or incompetent.
Words
does

functional word
делает
not

adverb
не
know

verb
знать
beans

noun
бобы