I'm thin, and there is no way that if two side-by-side urinals were being used that there would be even room for a 3rd to 'squeeze in'. And how the hell far were you from the urinal, 3 feet?, that gave him room to do that.
I'm sorry, but not sure I believe the OP.
Besides, I think you do that to an average guy, there is a damn good chance you get pissed on.