That's why you wait for class to start before you take a sheit. Or you show up mad earlier than everybody else and then take a sheit.
I know some teachers gonna be bishes, it was the black ones in my day, but I imagine they all bishes now. It would help also not looking like a bum, if you want favor for a hall pass. I managed to do it and I while wearing the same clothes thru out high school and they was thrift store maybe jcpenny every now and then. Or clothes my dad bought at the Base exchange.
All that fails, a school with a big atrium is a big school period, shiet over in a part of the school were the population will be low. Kids hang out at the cafeteria and gymnasium, find the farthest bathroom from that