Night Vision Whizzing ( or NVW ) is when you try to wee into the toilet bowl in a dark room. Ultimately resulting in weeing all over the seat or on the wall. But if you're a pro, you hit the jackpot every time.
Mum: WHO PEED ON THE SEAT AND DIDN'T CLEAN UP AFTER THEIR SELVES!!!
Thomas: Night Vision Whizzing is a hard job to do you know!