know (one's) stuff

(redirected from know my stuff)

know (one's) stuff

To be very knowledgeable or skilled in some area. I think Nicole is our best candidate for the job—she really knows her stuff when it comes to corporate accounting.
See also: know, stuff

know one's stuff

 and know one's onions
to know what one is expected to know. I know my stuff. I can do my job. She can't handle the assignment. She doesn't know her onions.
See also: know, stuff

know one's stuff

Also, know one's onions. Be experienced or knowledgeable in one's field or in the matter at hand. For example, Patrice knows her stuff when it comes to Mexican history, or We need a handyman who knows his onions. The allusion in the variant is unclear. [First half of 1900s]
See also: know, stuff

know your ˈstuff

(informal) know everything that you should know about a job, a subject, etc: I was very impressed by your lawyer. He really knows his stuff.
See also: know, stuff
References in periodicals archive ?
People know when it comes to education, I know my stuff and I fight for the right causes.
I've been through Equine College so I know my stuff.