ja benne azz
It's like when your brain goes to sleep and you just say 'I don't know' but with extra attitude.
During the test, he wrote 'Ja benne azz' on every question and got a D.
In the DMs, he said, 'Ja benne azz, I don’t know why you’re mad.'
He yelled at the teacher, 'Ja benne azz, I don’t know what you’re talking about!'