know (one's) beans

(redirected from knows beans)

know (one's) beans

To be knowledgeable about and/or very familiar with something. I had no idea you were such a good piano player—you really know your beans!
See also: bean, know
References in periodicals archive ?
Due to an editing error, in a story on Page 1 of the Montachusett T&G entitled "He Knows Beans," book signings at the Palmer library and Bruce's Browser with Athol author J.R.
in Indianapolis nearly 70 years ago, is a mid-20s product of the digital age, and he knows beans about downloads and MP3s.
It's a gracious statement, but in all likelihood Dillard knows beans about God.
He knows beans. Baggett's business partnerships have aided his success.