When a man can't urinate as planned due to some sort of outside obstruction that's causing severe loss of concentration. This can include other men talking, little privacy, or even no sound at all. This can usually be overcome by thinking of something completely random, like teddy bears on a jungle gym covered in mustard, or any Beatles song.
Man: Psst, dude, did you piss in there?
Dude: No man, it was way too loud, and the urinals didn't have dividers!
Man: Yeah no shit dude! I had to fake and shake!
Dude: Me too man!
Together: We need to get laid.