you know about it
On dit que tu t'y connais, en vin.
They say you know a thing or two about wine.
Tu t'y connais en romans, toi ?
You know a thing or two about novels, don't you?
— Dans ses yeux (2009)
Qu'est-ce que t'y connais, toi ?
What do you know about it, anyway?
— Ace Ventura, détective chiens et chats (1994)
Do you know anything about it?
La vie est dure, t'y connais rien.
Life is hard—you don't know anything about it.
— Decision to Leave (2022)
T'y connais quoi, prof de mes couilles ?
What the hell do you know, you shitty teacher?
— Irreversible (2002)