P.T.F.A. RETARD(S)
A P. T. F. A. RETARD(S) is someone who acts like they're dumb, even when they're not. They just don't want to pay attention.
He kept saying 'I don't get it' even though he had the notes from the beginning.
She said 'I didn't know the test was today' even though I texted her 2 hours ago.
He kept saying 'I didn't know what the question was' even though it was on the board.