tell me about it
US /tel mi əˈbaʊt ɪt/
UK /tel mi əˈbaʊt ɪt/

1.
parlez-en, c'est bien vrai
used to express sympathy or agreement with what someone has just said, especially when they have been complaining about something
:
•
“The traffic was terrible this morning.” “Tell me about it! I was stuck for an hour.”
«La circulation était terrible ce matin.» «Parlez-en ! J'étais coincé pendant une heure.»
•
“I'm so tired of all this paperwork.” “Tell me about it, I've been doing it all week.”
«J'en ai marre de toute cette paperasse.» «Parlez-en, je le fais toute la semaine.»