Been there, done that
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
The phrase is used in informal situations, often among friends or peers. 
When Jake talked about the tough hike, I nodded, 'been there, done that'.
Pro Tip 2/3Showing Empathy
Used to show understanding of someone's situation based on personal experience. 
He complained about noisy neighbors and I empathized, saying, 'been there, done that'.
Pro Tip 3/3Dismissive Tone
Can come across as dismissive if not used carefully, assuming others' experiences are identical to one's own. 
When she mentioned her struggle at work, my 'been there, done that' made her sigh.