I know, I was there - A kid’s way of telling someone to shut up and stop being a n

A kid’s way of telling someone to shut up and stop being a nagging pain in the ass, especially if the nagging pain is their teacher or parent.

'I know, I was there,' he shouted at his mom for the 10th time.

'I know, I was there,' he yelled at his teacher for telling him to stop talking.

'I know, I was there,' he said after his dad told him to clean his room for the 10th time.