Happened to me before . Here's the solution I used
When you gotta piss and shit...you first lay down the toliet paper on the seat if its not your home. For sanitary and also for shit catching purposes, because the second step is..
SIT AS FAR BACK AS POSSIBLE! Why? Because you got an errection and you also gotta piss/shit. That paper on the seat is going to be a lifesaver
Point down. If you're blessed like me, your thing might hit the water or the inside of the bowl. It's ok, you can always rinse that shit off. Better than pissing on the floor
Quickly take off your shoes and move your pants. JIC purposes
Point down, even if you gotta bend, and try to piss first. Much easier.
If you're positioned right, shit should fall too. If you're just way too big or the seat is way too small...that's why you put the paper down on the seat in step 1 to avoid the dreaded "shit on the back seat"
Happened to be after tearing this girl up. Had to piss and shit so badly it was horrible. And no, in this case, the last thing you worry about is stinking up someone's bathroom.