I mean... keep in mind you're urinating in the comfort of your own home, or in a public bathroom with maybe a handful of other people who don't give a damn about you doing your business.everytime i go to urinate it takes a while to empty it. there is no way it does a little stain like that if you pee your pants. come on lol.
Drake was literally pissing with Big Show holding onto his throat, in front of a live crowd and millions watching at home with a camera focusing on his dick. It's understandable that there would be SOME "stage fright" and he wouldn't be able to empty his whole bladder.