Top Definition
When there isn't any toilet paper in the restroom you've just pooped in, and you have to make a dash with poop on your asshole to another one.
Corissa: Why are you out of breath, and, by Jove, what is that smell?!

Kevin: Sorry babe, I'm on a Mud Run.
#ass-dash #swamp ass #mud butt #clean wipe #truffle butter
作者 TheRipper19496 2015年6月25日
When a man, gay or otherwise, has anal sex with at least 3 or 4 other men throughout the same day and night. Girls can be count as part of the mud run, but the one making the run is always a guy.
Guy 1: You guys wanna come over this weekend for a BBQ, some drinks and then maybe a mud run.

Guy 2: Ah, yeah, that could be fun. I've never done a mud run before.

Guy 1: You don't know what you're missing. You can even bring a couple of girls along, just not too many.
#anal #anal sex #gay marathon #girls are ok too #there's something on my dick
作者 small mammal 2013年5月13日
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