I ain't trippin!
A way to tell someone they're lying, and you know it. You're not just not confused. You're mad.
"I ain't trippin!" he said, because his buddy told him he won the lottery.
"I ain't trippin!" she said, because her coworker claimed she got a raise but didn't.
"I ain't trippin!" he yelled, because his brother said he got a free car.