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knows his stuff

Meaning that someone is very good at what he does, and knows a lot about it.
You: "The mechanic was able to repair my car withing seconds"

Your friend: "He knows his stuff"
knows his stuff by Tyreboy July 6, 2014

Knows his way around Istanbul 

The ability to bring a woman to orgasm using three fingers and a smoldering gaze.
No need to worry about Jim's chances of scoring tonight, that's a dude who knows his way around Istanbul.
Captain Birdseye: Aye Laddy, Have you tasted my brand new Fish Fingers?

DJ CrapWagon: Knows it, you smelly old man
knows it by Mc GoBadger April 7, 2005

knows one's onions

to be thoroughly knowledgeable or competent in a subject area
Look at her working that poll, she really knows one's onions.
knows one's onions by Drewster888 February 23, 2009

knows whats up 

A descriptive measure of a woman's predisposition to engage in sexual activities.

AKA: Down to Fuck, Puts Out, Down with the D
Person A: Hey, you that chick over there?
Person B: Yeah, I bet she knows whats up.
knows whats up by Bed Knight October 3, 2009

knows his shits 

Meaning that someone is very good at what he does, and knows a lot about it (basically the exact thing as "Knows his stuffs)
Random person roasts a feminist with impeccable logic..

You : This guy surely knows his shits!