The act of failing to urinate when stood at a urinal in a busy men's public toilet, despite really needing to. This is often followed by urinal miming
"I stood in the queue for 5 minutes, then got urinal panic when it was my turn to go. I just stood there pointing percy at the porcelain & nothing happened. In the end I had to do some urinal miming."
by John Superman December 6, 2013