Waiting wack is when you have enough time to wank one out to pass the time for whatever it is you are waiting for
I was waiting for my food order so I went into the bathroom and did a quick Waiting wank to pass the time
90% loading bar is what someone has if they have a habit of finishing a task to 90% of what was needed to be done
I asked John to clean the dishes but I forgot he has a 90% loading bar so now I have to finish it myself