The act of riding around in a car at night with a stockpile of Micky Dee's waters (no ice) and throwing them at people walking down the side of the road. The Trailer Park is another ideal location to perform this activity.
The funniest and most accurate technique is to pull up next to someone and pretend to ask them for directions. After they give you the directions you say "Thanks, hope you have a real McShitty day!" and cowardly drench their ass as they walk away, then hit the gas.
P.S. This sport has a few morals. No ice, head shots, hitting girls, old people, kids, or homeless people, and hitting moving cars is also not recommended. Remember the goal is to piss people off not hurt them.
1. Pile in the Infamous Red Jeep! Lets hit the drive-thru and do some McSplashin!
2. Do you think 12 waters will be enough to go McSplashin for the whole night?
3. That poor guy, already lives in a trailer park and now he has to watch over his shoulder for a McSlashin.