urinal miming
The act of standing at a public urinal with urinal shock & pretending to pee. This is done in order to avoid you looking weird to guys in the urinals next to you. Usually finished off with a fake snake shake & a loud, satisfied "ahhh".
"There was a queue! I couldn't just stand there waiting for the piss to come. I had to do some urinal miming & get the hell out."